diff --git a/cmd/agent/main.go b/cmd/agent/main.go
index ff5f297..09e5a2f 100644
--- a/cmd/agent/main.go
+++ b/cmd/agent/main.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -140,6 +141,20 @@ var registerCmd = &cobra.Command{
 	Run:   registerAgent,
 }
 
+// logCmd 查看日志命令
+var logCmd = &cobra.Command{
+	Use:   "log",
+	Short: "查看日志",
+	Long:  `查看 Agent 运行日志，支持实时跟踪`,
+	Run:   viewLog,
+}
+
+var (
+	logFollow  bool
+	logLines   int
+	logService bool
+)
+
 // infoCmd 信息命令
 var infoCmd = &cobra.Command{
 	Use:   "info",
@@ -174,10 +189,16 @@ func init() {
 	registerCmd.Flags().StringVarP(&agentName, "name", "n", "", "探针名称（默认使用主机名）")
 	registerCmd.Flags().BoolVarP(&autoConfirm, "yes", "y", false, "自动确认配置并继续安装")
 
+	// log 命令参数
+	logCmd.Flags().BoolVarP(&logFollow, "follow", "f", false, "实时跟踪日志输出")
+	logCmd.Flags().IntVarP(&logLines, "lines", "n", 100, "显示最近多少行日志")
+	logCmd.Flags().BoolVarP(&logService, "service", "s", false, "强制查看服务日志（跳过日志文件）")
+
 	// 添加子命令
 	rootCmd.AddCommand(versionCmd)
 	rootCmd.AddCommand(registerCmd) // 注册命令放在前面，方便用户发现
 	rootCmd.AddCommand(infoCmd)
+	rootCmd.AddCommand(logCmd)
 	rootCmd.AddCommand(runCmd)
 	rootCmd.AddCommand(installCmd)
 	rootCmd.AddCommand(uninstallCmd)
@@ -591,3 +612,196 @@ func showInfo(cmd *cobra.Command, args []string) {
 	fmt.Printf("   主机名: %s\n", hostname)
 	fmt.Println()
 }
+
+// viewLog 查看日志
+func viewLog(cmd *cobra.Command, args []string) {
+	// 加载配置
+	cfg, err := config.Load(configPath)
+	if err != nil {
+		log.Fatalf("❌ 加载配置失败: %v", err)
+	}
+
+	// 判断是否以服务模式运行
+	serviceRunning := false
+	if runtime.GOOS == "linux" {
+		// 检查 systemd 服务状态
+		if out, err := exec.Command("systemctl", "is-active", "pika-agent").CombinedOutput(); err == nil && strings.TrimSpace(string(out)) == "active" {
+			serviceRunning = true
+		}
+	} else if runtime.GOOS == "darwin" {
+		if out, err := exec.Command("launchctl", "list", "org.pika.pika-agent").CombinedOutput(); err == nil && len(strings.TrimSpace(string(out))) > 0 {
+			serviceRunning = true
+		}
+	} else if runtime.GOOS == "windows" {
+		if out, err := exec.Command("sc", "query", "pika-agent").CombinedOutput(); err == nil && strings.Contains(string(out), "RUNNING") {
+			serviceRunning = true
+		}
+	}
+
+	// 决定日志来源
+	// 1. 如果指定了 --service 或者服务正在运行，查看服务日志
+	// 2. 否则，查看日志文件
+	if logService || serviceRunning {
+		viewServiceLog(cfg)
+	} else {
+		viewLogFile(cfg)
+	}
+}
+
+// viewServiceLog 查看系统服务日志
+func viewServiceLog(cfg *config.Config) {
+	switch runtime.GOOS {
+	case "linux":
+		viewLinuxServiceLog(cfg)
+	case "darwin":
+		viewDarwinServiceLog()
+	case "windows":
+		viewWindowsServiceLog()
+	default:
+		log.Printf("⚠️  当前系统 (%s) 不支持查看服务日志", runtime.GOOS)
+	}
+}
+
+// viewLinuxServiceLog Linux 系统服务日志查看（优先 journalctl，空时回退到日志文件）
+func viewLinuxServiceLog(cfg *config.Config) {
+	args := []string{"journalctl", "-u", "pika-agent", "-n", fmt.Sprintf("%d", logLines)}
+	if logFollow {
+		args = append(args, "-f")
+	}
+
+	// 非跟踪模式：先检查 journal 是否为空
+	if !logFollow {
+		out, err := exec.Command(args[0], args[1:]...).CombinedOutput()
+		output := strings.TrimSpace(string(out))
+		if err != nil || output == "" || strings.Contains(output, "-- No entries --") {
+			// journal 为空，回退到日志文件
+			viewLogFile(cfg)
+			return
+		}
+		fmt.Printf("📋 系统服务日志 (最近 %d 行)：\n", logLines)
+		fmt.Println(strings.Repeat("─", 50))
+		fmt.Println(output)
+		return
+	}
+
+	// 跟踪模式：先快速检查 journal 是否有内容，再决定是否回退
+	checkOut, _ := exec.Command("journalctl", "-u", "pika-agent", "-n", "1").CombinedOutput()
+	checkOutput := strings.TrimSpace(string(checkOut))
+	if checkOutput == "" || strings.Contains(checkOutput, "-- No entries --") {
+		// journal 为空，回退到日志文件
+		viewLogFile(cfg)
+		return
+	}
+
+	fmt.Printf("📋 正在跟踪系统服务日志 (最近 %d 行)...\n", logLines)
+	fmt.Println("按 Ctrl+C 退出")
+	fmt.Println()
+
+	cmd := exec.Command(args[0], args[1:]...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		log.Printf("⚠️  查看服务日志失败: %v", err)
+	}
+}
+
+// viewDarwinServiceLog macOS 系统服务日志查看
+func viewDarwinServiceLog() {
+	args := []string{"log", "show"}
+	args = append(args, "--predicate", `subsystem == "org.pika.pika-agent"`)
+	args = append(args, "--last", fmt.Sprintf("%d", logLines))
+	if logFollow {
+		args = append(args, "--stream")
+	}
+
+	if logFollow {
+		fmt.Printf("📋 正在跟踪系统服务日志 (最近 %d 行)...\n", logLines)
+		fmt.Println("按 Ctrl+C 退出")
+		fmt.Println()
+	} else {
+		fmt.Printf("📋 系统服务日志 (最近 %d 行)：\n", logLines)
+		fmt.Println(strings.Repeat("─", 50))
+	}
+
+	cmd := exec.Command(args[0], args[1:]...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		log.Printf("⚠️  查看服务日志失败: %v", err)
+	}
+}
+
+// viewWindowsServiceLog Windows 系统服务日志查看
+func viewWindowsServiceLog() {
+	psCmd := fmt.Sprintf("Get-WinEvent -FilterHashtable @{LogName='Application';ProviderName='pika-agent'} -MaxEvents %d | Format-List TimeCreated, Message", logLines)
+	cmd := exec.Command("powershell", "-NoProfile", "-Command", psCmd)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	if logFollow {
+		fmt.Printf("📋 正在跟踪系统服务日志 (最近 %d 行)...\n", logLines)
+		fmt.Println("按 Ctrl+C 退出")
+		fmt.Println()
+	} else {
+		fmt.Printf("📋 系统服务日志 (最近 %d 行)：\n", logLines)
+		fmt.Println(strings.Repeat("─", 50))
+	}
+
+	if err := cmd.Run(); err != nil {
+		log.Printf("⚠️  查看服务日志失败: %v", err)
+	}
+}
+
+// viewLogFile 查看日志文件
+func viewLogFile(cfg *config.Config) {
+	logFile := cfg.Agent.LogFile
+	if logFile == "" {
+		// 默认日志路径
+		logFile = getHomeLogPath()
+	}
+
+	// 检查日志文件是否存在
+	if _, err := os.Stat(logFile); os.IsNotExist(err) {
+		log.Printf("⚠️  日志文件不存在: %s", logFile)
+		fmt.Println()
+		fmt.Println("💡 提示: 如果 Agent 以服务方式运行，请使用以下命令查看日志:")
+		if runtime.GOOS == "linux" {
+			fmt.Println("   journalctl -u pika-agent -n 100 -f")
+		} else if runtime.GOOS == "darwin" {
+			fmt.Println("   log show --predicate 'subsystem == \"org.pika.pika-agent\"' --last 100")
+		} else if runtime.GOOS == "windows" {
+			fmt.Println("   Get-WinEvent -FilterHashtable @{LogName='Application';ProviderName='pika-agent'} -MaxEvents 100")
+		}
+		fmt.Println()
+		fmt.Println("或者使用 --service 参数直接查看服务日志:")
+		fmt.Println("   agent log --service")
+		return
+	}
+
+	if logFollow {
+		fmt.Printf("📋 正在跟踪日志: %s (最近 %d 行)...\n", logFile, logLines)
+		fmt.Println("按 Ctrl+C 退出")
+		fmt.Println(strings.Repeat("─", 50))
+
+		// 使用 tail -f
+		cmd := exec.Command("tail", "-f", "-n", fmt.Sprintf("%d", logLines), logFile)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+
+		if err := cmd.Run(); err != nil {
+			log.Printf("⚠️  跟踪日志失败: %v", err)
+		}
+	} else {
+		fmt.Printf("📋 日志文件: %s (最近 %d 行)\n", logFile, logLines)
+		fmt.Println(strings.Repeat("─", 50))
+
+		// 读取文件最后 N 行
+		cmd := exec.Command("tail", "-n", fmt.Sprintf("%d", logLines), logFile)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+
+		if err := cmd.Run(); err != nil {
+			log.Printf("⚠️  读取日志失败: %v", err)
+		}
+	}
+}
diff --git a/internal/service/metric_service.go b/internal/service/metric_service.go
index 354a9f2..5eb7038 100644
--- a/internal/service/metric_service.go
+++ b/internal/service/metric_service.go
@@ -184,6 +184,11 @@ func (s *MetricService) HandleMetricData(ctx context.Context, agentID string, me
 		if err := json.Unmarshal(data, &diskDataList); err != nil {
 			return err
 		}
+		// 无有效磁盘数据时，不更新缓存（保留上一次有效值）
+		if len(diskDataList) == 0 {
+			metrics := s.convertToMetrics(agentID, metricType, diskDataList, timestamp)
+			return s.vmClient.Write(ctx, metrics)
+		}
 		// 计算汇总数据用于缓存
 		var totalTotal, totalUsed, totalFree uint64
 		for _, diskData := range diskDataList {
@@ -191,10 +196,7 @@ func (s *MetricService) HandleMetricData(ctx context.Context, agentID string, me
 			totalUsed += diskData.Used
 			totalFree += diskData.Free
 		}
-		var usagePercent float64
-		if totalTotal > 0 {
-			usagePercent = float64(totalUsed) / float64(totalTotal) * 100
-		}
+		usagePercent := float64(totalUsed) / float64(totalTotal) * 100
 		latestMetrics.Disk = &metric.DiskSummary{
 			UsagePercent: usagePercent,
 			TotalDisks:   len(diskDataList),
@@ -210,6 +212,11 @@ func (s *MetricService) HandleMetricData(ctx context.Context, agentID string, me
 		if err := json.Unmarshal(data, &networkDataList); err != nil {
 			return err
 		}
+		// 无有效网络数据时，不更新缓存（保留上一次有效值）
+		if len(networkDataList) == 0 {
+			metrics := s.convertToMetrics(agentID, metricType, networkDataList, timestamp)
+			return s.vmClient.Write(ctx, metrics)
+		}
 		// 计算汇总数据用于缓存
 		var totalSentRate, totalRecvRate uint64
 		var totalSentTotal, totalRecvTotal uint64
@@ -266,6 +273,11 @@ func (s *MetricService) HandleMetricData(ctx context.Context, agentID string, me
 		if err := json.Unmarshal(data, &gpuDataList); err != nil {
 			return err
 		}
+		// 无 GPU 数据时，不更新缓存
+		if len(gpuDataList) == 0 {
+			metrics := s.convertToMetrics(agentID, metricType, gpuDataList, timestamp)
+			return s.vmClient.Write(ctx, metrics)
+		}
 		// 更新缓存
 		latestMetrics.GPU = gpuDataList
 		metrics := s.convertToMetrics(agentID, metricType, gpuDataList, timestamp)
@@ -276,6 +288,11 @@ func (s *MetricService) HandleMetricData(ctx context.Context, agentID string, me
 		if err := json.Unmarshal(data, &tempDataList); err != nil {
 			return err
 		}
+		// 无温度数据时，不更新缓存
+		if len(tempDataList) == 0 {
+			metrics := s.convertToMetrics(agentID, metricType, tempDataList, timestamp)
+			return s.vmClient.Write(ctx, metrics)
+		}
 		// 更新缓存
 		latestMetrics.Temp = tempDataList
 		metrics := s.convertToMetrics(agentID, metricType, tempDataList, timestamp)
diff --git a/pkg/agent/collector/disk.go b/pkg/agent/collector/disk.go
index 7bcf67e..ec61350 100644
--- a/pkg/agent/collector/disk.go
+++ b/pkg/agent/collector/disk.go
@@ -57,5 +57,10 @@ func (d *DiskCollector) Collect() ([]protocol.DiskData, error) {
 		diskDataList = append(diskDataList, diskData)
 	}
 
+	// 所有白名单分区均采集失败时，返回空列表表示异常
+	if len(diskDataList) == 0 {
+		return nil, nil
+	}
+
 	return diskDataList, nil
 }
diff --git a/pkg/agent/collector/gpu.go b/pkg/agent/collector/gpu.go
index 91918fe..4cbfb4f 100644
--- a/pkg/agent/collector/gpu.go
+++ b/pkg/agent/collector/gpu.go
@@ -1,15 +1,19 @@
 package collector
 
 import (
+	"context"
 	"encoding/csv"
 	"os/exec"
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/dushixiang/pika/internal/protocol"
 )
 
+const nvidiaSmiTimeout = 15 * time.Second
+
 // gpuStaticInfo GPU 静态信息
 type gpuStaticInfo struct {
 	Index       int
@@ -42,7 +46,9 @@ func (g *GPUCollector) initStatic() {
 		}
 
 		// 查询静态信息: index, name, uuid, memory.total
-		cmd := exec.Command("nvidia-smi",
+		ctx, cancel := context.WithTimeout(context.Background(), nvidiaSmiTimeout)
+		defer cancel()
+		cmd := exec.CommandContext(ctx, "nvidia-smi",
 			"--query-gpu=index,name,uuid,memory.total",
 			"--format=csv,noheader,nounits")
 
@@ -105,7 +111,9 @@ func (g *GPUCollector) Collect() ([]*protocol.GPUData, error) {
 func (g *GPUCollector) collectDynamic() ([]*protocol.GPUData, error) {
 	// 使用 nvidia-smi 查询动态数据
 	// 输出格式: index, temperature.gpu, utilization.gpu, memory.used, memory.free, power.draw, fan.speed
-	cmd := exec.Command("nvidia-smi",
+	ctx, cancel := context.WithTimeout(context.Background(), nvidiaSmiTimeout)
+	defer cancel()
+	cmd := exec.CommandContext(ctx, "nvidia-smi",
 		"--query-gpu=index,temperature.gpu,utilization.gpu,memory.used,memory.free,power.draw,fan.speed",
 		"--format=csv,noheader,nounits")
 
diff --git a/pkg/agent/collector/manager.go b/pkg/agent/collector/manager.go
index 5b8256c..7f13b8c 100644
--- a/pkg/agent/collector/manager.go
+++ b/pkg/agent/collector/manager.go
@@ -67,8 +67,9 @@ func (m *Manager) CollectAndSendMemory(conn WebSocketWriter) error {
 // CollectAndSendDisk 采集并发送磁盘指标
 func (m *Manager) CollectAndSendDisk(conn WebSocketWriter) error {
 	diskDataList, err := m.diskCollector.Collect()
-	if err != nil {
-		return err
+	if err != nil || len(diskDataList) == 0 {
+		// 采集失败或无有效数据，不发送空列表
+		return nil
 	}
 	return m.sendMetrics(conn, protocol.MetricTypeDisk, diskDataList)
 }
@@ -85,8 +86,9 @@ func (m *Manager) CollectAndSendDiskIO(conn WebSocketWriter) error {
 // CollectAndSendNetwork 采集并发送网络指标
 func (m *Manager) CollectAndSendNetwork(conn WebSocketWriter) error {
 	networkDataList, err := m.networkCollector.Collect()
-	if err != nil {
-		return err
+	if err != nil || len(networkDataList) == 0 {
+		// 采集失败或无有效数据，不发送空列表
+		return nil
 	}
 	return m.sendMetrics(conn, protocol.MetricTypeNetwork, networkDataList)
 }
diff --git a/pkg/agent/service/agent.go b/pkg/agent/service/agent.go
index 98e0f3e..71028ab 100644
--- a/pkg/agent/service/agent.go
+++ b/pkg/agent/service/agent.go
@@ -28,9 +28,10 @@ import (
 )
 
 const (
-	agentPingInterval = 10 * time.Second
-	agentPongWait     = 30 * time.Second
-	agentWriteWait    = 5 * time.Second
+	agentPingInterval       = 10 * time.Second
+	agentPongWait           = 30 * time.Second
+	agentWriteWait          = 5 * time.Second
+	agentCollectTimeout     = 30 * time.Second
 )
 
 // safeConn 线程安全的 WebSocket 连接包装器
@@ -63,6 +64,13 @@ func (sc *safeConn) Close() error {
 	return sc.conn.Close()
 }
 
+// WriteControl 线程安全地写入控制消息
+func (sc *safeConn) WriteControl(messageType int, data []byte, deadline time.Time) error {
+	sc.mu.Lock()
+	defer sc.mu.Unlock()
+	return sc.conn.WriteControl(messageType, data, deadline)
+}
+
 // Agent 探针服务
 type Agent struct {
 	cfg              *config.Config
@@ -222,7 +230,7 @@ func (a *Agent) runOnce(ctx context.Context, onRegistered func()) error {
 
 	// 主动发送 Ping，快速检测断线
 	wg.Go(func() {
-		if err := a.pingLoop(ctx, rawConn, done); err != nil {
+		if err := a.pingLoop(ctx, conn, done); err != nil {
 			select {
 			case errChan <- fmt.Errorf("ping失败: %w", err):
 			default:
@@ -314,7 +322,7 @@ func (a *Agent) readLoop(conn *websocket.Conn, done chan struct{}) error {
 	}
 }
 
-func (a *Agent) pingLoop(ctx context.Context, conn *websocket.Conn, done chan struct{}) error {
+func (a *Agent) pingLoop(ctx context.Context, conn *safeConn, done chan struct{}) error {
 	ticker := time.NewTicker(agentPingInterval)
 	defer ticker.Stop()
 
@@ -529,6 +537,42 @@ func (a *Agent) collectAndSendAllMetrics(manager *collector.Manager) error {
 		return fmt.Errorf("采集器未初始化")
 	}
 
+	type result struct {
+		err error
+	}
+	done := make(chan result, 1)
+
+	go func() {
+		done <- result{err: a.doCollectAndSend(manager)}
+	}()
+
+	select {
+	case r := <-done:
+		return r.err
+	case <-time.After(agentCollectTimeout):
+		return fmt.Errorf("指标采集超时 (超过 %v)", agentCollectTimeout)
+	}
+}
+
+// collectTimer 采集耗时计时器，记录每个采集器的耗时
+type collectTimer struct {
+	name  string
+	start time.Time
+}
+
+func newCollectTimer(name string) *collectTimer {
+	return &collectTimer{name: name, start: time.Now()}
+}
+
+func (t *collectTimer) done() {
+	d := time.Since(t.start)
+	if d > 500*time.Millisecond {
+		slog.Info("采集耗时", "collector", t.name, "duration", d)
+	}
+}
+
+// doCollectAndSend 执行实际的采集和发送
+func (a *Agent) doCollectAndSend(manager *collector.Manager) error {
 	conn := a.getActiveConn()
 	if conn != nil {
 		if sent, err := a.outboundBuffer.Flush(conn); err != nil {
@@ -543,56 +587,92 @@ func (a *Agent) collectAndSendAllMetrics(manager *collector.Manager) error {
 	var hasError bool
 
 	// CPU 动态指标
-	if err := manager.CollectAndSendCPU(bw); err != nil {
-		slog.Warn("采集CPU指标失败", "error", err)
-		hasError = true
-	}
+	func() {
+		t := newCollectTimer("cpu")
+		defer t.done()
+		if err := manager.CollectAndSendCPU(bw); err != nil {
+			slog.Warn("采集CPU指标失败", "error", err)
+			hasError = true
+		}
+	}()
 
 	// 内存动态指标
-	if err := manager.CollectAndSendMemory(bw); err != nil {
-		slog.Warn("采集内存指标失败", "error", err)
-		hasError = true
-	}
+	func() {
+		t := newCollectTimer("memory")
+		defer t.done()
+		if err := manager.CollectAndSendMemory(bw); err != nil {
+			slog.Warn("采集内存指标失败", "error", err)
+			hasError = true
+		}
+	}()
 
 	// 磁盘指标
-	if err := manager.CollectAndSendDisk(bw); err != nil {
-		slog.Warn("采集磁盘指标失败", "error", err)
-		hasError = true
-	}
+	func() {
+		t := newCollectTimer("disk")
+		defer t.done()
+		if err := manager.CollectAndSendDisk(bw); err != nil {
+			slog.Warn("采集磁盘指标失败", "error", err)
+			hasError = true
+		}
+	}()
 
 	// 磁盘 IO 指标
-	if err := manager.CollectAndSendDiskIO(bw); err != nil {
-		slog.Warn("采集磁盘IO指标失败", "error", err)
-		hasError = true
-	}
+	func() {
+		t := newCollectTimer("disk_io")
+		defer t.done()
+		if err := manager.CollectAndSendDiskIO(bw); err != nil {
+			slog.Warn("采集磁盘IO指标失败", "error", err)
+			hasError = true
+		}
+	}()
 
 	// 网络指标
-	if err := manager.CollectAndSendNetwork(bw); err != nil {
-		slog.Warn("采集网络指标失败", "error", err)
-		hasError = true
-	}
+	func() {
+		t := newCollectTimer("network")
+		defer t.done()
+		if err := manager.CollectAndSendNetwork(bw); err != nil {
+			slog.Warn("采集网络指标失败", "error", err)
+			hasError = true
+		}
+	}()
 
 	// 网络连接统计
-	if err := manager.CollectAndSendNetworkConnection(bw); err != nil {
-		slog.Warn("采集网络连接统计失败", "error", err)
-		hasError = true
-	}
+	func() {
+		t := newCollectTimer("network_connection")
+		defer t.done()
+		if err := manager.CollectAndSendNetworkConnection(bw); err != nil {
+			slog.Warn("采集网络连接统计失败", "error", err)
+			hasError = true
+		}
+	}()
 
 	// 主机信息（包含 Load）
-	if err := manager.CollectAndSendHost(bw); err != nil {
-		slog.Warn("采集主机信息失败", "error", err)
-		hasError = true
-	}
+	func() {
+		t := newCollectTimer("host")
+		defer t.done()
+		if err := manager.CollectAndSendHost(bw); err != nil {
+			slog.Warn("采集主机信息失败", "error", err)
+			hasError = true
+		}
+	}()
 
 	// GPU 信息（可选）
-	if err := manager.CollectAndSendGPU(bw); err != nil {
-		slog.Info("采集GPU信息失败", "error", err)
-	}
+	func() {
+		t := newCollectTimer("gpu")
+		defer t.done()
+		if err := manager.CollectAndSendGPU(bw); err != nil {
+			slog.Info("采集GPU信息失败", "error", err)
+		}
+	}()
 
 	// 温度信息（可选）
-	if err := manager.CollectAndSendTemperature(bw); err != nil {
-		slog.Info("采集温度信息失败", "error", err)
-	}
+	func() {
+		t := newCollectTimer("temperature")
+		defer t.done()
+		if err := manager.CollectAndSendTemperature(bw); err != nil {
+			slog.Info("采集温度信息失败", "error", err)
+		}
+	}()
 
 	// 发送打包后的指标
 	if len(bw.items) > 0 {
@@ -613,6 +693,8 @@ func (a *Agent) collectAndSendAllMetrics(manager *collector.Manager) error {
 			slog.Info("当前连接不可用，消息已写入缓存")
 		} else if writer.sendErr != nil {
 			slog.Warn("发送消息失败，已写入缓存", "error", writer.sendErr)
+			// 连接写失败视为连接异常，返回错误触发重连
+			return fmt.Errorf("连接发送失败: %w", writer.sendErr)
 		}
 	}
 
diff --git a/pkg/agent/service/metrics_buffer.go b/pkg/agent/service/metrics_buffer.go
index f97da7f..cc52008 100644
--- a/pkg/agent/service/metrics_buffer.go
+++ b/pkg/agent/service/metrics_buffer.go
@@ -236,7 +236,7 @@ func (w *outboundWriter) WriteJSON(v interface{}) error {
 		}
 		w.buffered = true
 		w.sendErr = err
-		return nil
+		return err
 	}
 
 	return nil
diff --git a/pkg/agent/service/service.go b/pkg/agent/service/service.go
index 65dc828..c93a9fa 100644
--- a/pkg/agent/service/service.go
+++ b/pkg/agent/service/service.go
@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/signal"
 	"runtime"
+	"strings"
 	"syscall"
 
 	"github.com/dushixiang/pika/pkg/agent"
@@ -203,7 +204,23 @@ func NewServiceManager(cfg *config.Config) (*ServiceManager, error) {
 
 // Install 安装服务
 func (m *ServiceManager) Install() error {
-	return m.service.Install()
+	// 先尝试直接安装
+	err := m.service.Install()
+	if err == nil {
+		return nil
+	}
+
+	// 只有当是"服务已存在"的错误时才清理重装
+	if strings.Contains(err.Error(), "already exists") {
+		slog.Info("服务已存在，先清理旧服务再重新安装...")
+		_ = m.service.Stop()
+		_ = m.service.Uninstall()
+		// 再次尝试安装
+		return m.service.Install()
+	}
+
+	// 其他错误直接返回
+	return err
 }
 
 // Uninstall 卸载服务
diff --git a/web/src/admin/components/PrivateRoute.tsx b/web/src/admin/components/PrivateRoute.tsx
index d27aabc..82d5fee 100644
--- a/web/src/admin/components/PrivateRoute.tsx
+++ b/web/src/admin/components/PrivateRoute.tsx
@@ -1,4 +1,3 @@
-import { Navigate } from 'react-router-dom';
 import type { ReactNode } from 'react';
 
 interface PrivateRouteProps {
@@ -13,9 +12,9 @@ const PrivateRoute = ({ children }: PrivateRouteProps) => {
     const token = localStorage.getItem('token');
     const userInfo = localStorage.getItem('userInfo');
 
-    // 如果没有登录信息，重定向到登录页
+    // 如果没有登录信息，返回空占位
     if (!token || !userInfo) {
-        return <Navigate to="/login" replace />;
+        return null;
     }
 
     // 已登录，渲染子组件
diff --git a/web/src/admin/pages/AdminLayout/index.tsx b/web/src/admin/pages/AdminLayout/index.tsx
index 210a369..4b885b1 100644
--- a/web/src/admin/pages/AdminLayout/index.tsx
+++ b/web/src/admin/pages/AdminLayout/index.tsx
@@ -90,7 +90,6 @@ const AdminLayout = () => {
         const userInfoStr = localStorage.getItem('userInfo');
 
         if (!token || !userInfoStr) {
-            navigate('/login');
             return;
         }
 
diff --git a/web/src/api/request.ts b/web/src/api/request.ts
index dc42f9d..7c95398 100644
--- a/web/src/api/request.ts
+++ b/web/src/api/request.ts
@@ -81,7 +81,6 @@ const sendRequest = async <T>(url: string, config: RequestConfig = {}): Promise<
         if (response.status === 401) {
             localStorage.removeItem('token');
             localStorage.removeItem('userInfo');
-            window.location.href = '/login';
             throw new HttpError('未认证或认证已过期', {
                 status: response.status,
                 statusText: response.statusText,
diff --git a/web/src/portal/components/CyberCard.tsx b/web/src/portal/components/CyberCard.tsx
index 5524ce4..5204620 100644
--- a/web/src/portal/components/CyberCard.tsx
+++ b/web/src/portal/components/CyberCard.tsx
@@ -17,16 +17,16 @@ const CyberCard = ({className, children, animation, hover}: Props) => {
             )}>
             {/* 装饰性边框 - 仅在暗色模式下显示 */}
             <div
-                className="hidden dark:block absolute top-0 left-0 w-2 h-2 border-t-2 border-l-2 border-cyan-500/30 group-hover:border-cyan-400 transition-colors"></div>
+                className="hidden dark:block absolute top-0 left-0 w-2 h-2 border-t-2 border-l-2 border-cyan-500/30 group-hover:border-cyan-400 transition-colors duration-300"></div>
             <div
-                className="hidden dark:block absolute top-0 right-0 w-2 h-2 border-t-2 border-r-2 border-cyan-500/30 group-hover:border-cyan-400 transition-colors"></div>
+                className="hidden dark:block absolute top-0 right-0 w-2 h-2 border-t-2 border-r-2 border-cyan-500/30 group-hover:border-cyan-400 transition-colors duration-300"></div>
             <div
-                className="hidden dark:block absolute bottom-0 left-0 w-2 h-2 border-b-2 border-l-2 border-cyan-500/30 group-hover:border-cyan-400 transition-colors"></div>
+                className="hidden dark:block absolute bottom-0 left-0 w-2 h-2 border-b-2 border-l-2 border-cyan-500/30 group-hover:border-cyan-400 transition-colors duration-300"></div>
             <div
-                className="hidden dark:block absolute bottom-0 right-0 w-2 h-2 border-b-2 border-r-2 border-cyan-500/30 group-hover:border-cyan-400 transition-colors"></div>
+                className="hidden dark:block absolute bottom-0 right-0 w-2 h-2 border-b-2 border-r-2 border-cyan-500/30 group-hover:border-cyan-400 transition-colors duration-300"></div>
             {animation &&
                 <div
-                    className="hidden dark:block absolute inset-0 bg-gradient-to-b from-transparent via-cyan-500/5 to-transparent -translate-y-full group-hover:translate-y-full transition-transform duration-1000 ease-in-out pointer-events-none"/>
+                    className="hidden dark:block absolute inset-0 bg-gradient-to-b from-transparent via-cyan-500/5 to-transparent opacity-0 group-hover:opacity-100 -translate-y-full group-hover:translate-y-full transition-[transform,opacity] duration-1000 ease-in-out pointer-events-none will-change-transform"/>
             }
 
             <div className={cn("relative z-10 p-4", className)}>