diff --git a/frontend/package.json b/frontend/package.json
index c8ce1a0..d9c1a4a 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -27,6 +27,7 @@
   },
   "dependencies": {
     "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-select": "^2.2.6",
     "@radix-ui/react-slot": "^1.2.4",
     "@tailwindcss/postcss": "^4.2.2",
     "@tanstack/react-query": "^5.97.0",
diff --git a/frontend/src/components/ui/button.tsx b/frontend/src/components/ui/button.tsx
index 58c87eb..a244d96 100644
--- a/frontend/src/components/ui/button.tsx
+++ b/frontend/src/components/ui/button.tsx
@@ -12,7 +12,7 @@ const buttonVariants = cva(
         destructive:
           "bg-destructive text-destructive-foreground shadow-sm hover:bg-destructive/90",
         outline:
-          "border border-input bg-background shadow-sm hover:bg-accent hover:text-accent-foreground hover:border-accent-foreground/20",
+          "border border-input shadow-sm hover:bg-accent hover:text-accent-foreground hover:border-accent-foreground/20",
         secondary:
           "bg-secondary text-secondary-foreground shadow-sm hover:bg-secondary/80",
         ghost: "hover:bg-accent hover:text-accent-foreground",
diff --git a/frontend/src/components/ui/input.tsx b/frontend/src/components/ui/input.tsx
index 4412396..fb39b91 100644
--- a/frontend/src/components/ui/input.tsx
+++ b/frontend/src/components/ui/input.tsx
@@ -7,7 +7,7 @@ const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<"input">>(
       <input
         type={type}
         className={cn(
-          "flex h-10 w-full rounded-lg border border-input bg-background px-3 py-2 text-sm shadow-sm transition-all duration-200 file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:border-primary/50 hover:border-muted-foreground/30 disabled:cursor-not-allowed disabled:opacity-50",
+          "flex h-10 w-full rounded-lg border border-input px-3 py-2 text-sm shadow-sm transition-all duration-200 file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:border-primary/50 hover:border-muted-foreground/30 disabled:cursor-not-allowed disabled:opacity-50",
           className
         )}
         ref={ref}
diff --git a/frontend/src/components/ui/select.tsx b/frontend/src/components/ui/select.tsx
index b5da520..b2d253c 100644
--- a/frontend/src/components/ui/select.tsx
+++ b/frontend/src/components/ui/select.tsx
@@ -1,21 +1,187 @@
-import * as React from "react"
-import { cn } from "@/lib/utils"
+import * as React from "react";
+import * as SelectPrimitive from "@radix-ui/react-select";
+import { Check, ChevronDown, ChevronUp } from "lucide-react";
+import { cn } from "@/lib/utils";
 
-const Select = React.forwardRef<
-  HTMLSelectElement,
-  React.ComponentProps<"select">
->(({ className, ...props }, ref) => {
-  return (
-    <select
-      className={cn(
-        "flex h-10 w-full rounded-lg border border-input bg-background px-3 py-2 text-sm shadow-sm transition-all duration-200 focus-visible:outline-none focus-visible:border-primary/50 hover:border-muted-foreground/30 cursor-pointer disabled:cursor-not-allowed disabled:opacity-50",
-        className
-      )}
-      ref={ref}
-      {...props}
-    />
-  )
-})
-Select.displayName = "Select"
+type NativeSelectProps = Omit<React.ComponentProps<"select">, "children" | "onChange" | "size">;
 
-export { Select }
+interface SelectProps extends NativeSelectProps {
+  children: React.ReactNode;
+  onChange?: (event: React.ChangeEvent<HTMLSelectElement>) => void;
+  placeholder?: string;
+  contentClassName?: string;
+}
+
+interface SelectOption {
+  value: string;
+  label: React.ReactNode;
+  disabled?: boolean;
+}
+
+const TRIGGER_BASE_CLASS =
+  "group relative flex h-10 w-full items-center rounded-lg border border-input/90 bg-card/90 px-3 py-2 pr-12 text-sm text-foreground shadow-sm outline-none transition-all duration-200 hover:border-primary/25 hover:bg-card focus-visible:border-primary/55 focus-visible:ring-4 focus-visible:ring-primary/10 disabled:cursor-not-allowed disabled:opacity-50 data-[placeholder]:text-muted-foreground";
+
+const CONTENT_BASE_CLASS =
+  "z-50 max-h-72 min-w-[var(--radix-select-trigger-width)] overflow-hidden rounded-lg border border-border/70 bg-popover/95 p-1.5 text-popover-foreground shadow-md backdrop-blur-xl data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=top]:slide-in-from-bottom-2 dark:shadow-[0_24px_70px_-24px_hsl(0_0%_0%_/_0.8)]";
+
+const ITEM_BASE_CLASS =
+  "relative flex w-full select-none items-center rounded-lg px-3 py-2 pr-9 text-xs text-foreground outline-none transition-all duration-150 data-[disabled]:pointer-events-none data-[disabled]:opacity-45 data-[highlighted]:bg-primary/10 data-[highlighted]:text-foreground data-[state=checked]:bg-primary/8";
+
+const isElementOfType = (
+  child: React.ReactNode,
+  type: "option" | "optgroup",
+): child is React.ReactElement<React.HTMLAttributes<HTMLElement>> => React.isValidElement(child) && child.type === type;
+
+const extractOptions = (children: React.ReactNode): SelectOption[] => {
+  const options: SelectOption[] = [];
+
+  React.Children.forEach(children, (child) => {
+    if (!child) return;
+
+    if (React.isValidElement(child) && child.type === React.Fragment) {
+      options.push(...extractOptions(child.props.children));
+      return;
+    }
+
+    if (isElementOfType(child, "optgroup")) {
+      options.push(...extractOptions(child.props.children));
+      return;
+    }
+
+    if (!isElementOfType(child, "option")) {
+      return;
+    }
+
+    const rawValue = child.props.value;
+    if (rawValue == null) {
+      return;
+    }
+
+    options.push({
+      value: String(rawValue),
+      label: child.props.children,
+      disabled: Boolean(child.props.disabled),
+    });
+  });
+
+  return options;
+};
+
+const Select = React.forwardRef<HTMLButtonElement, SelectProps>(
+  (
+    {
+      children,
+      className,
+      contentClassName,
+      disabled,
+      form,
+      id,
+      name,
+      required,
+      autoComplete,
+      dir,
+      value,
+      defaultValue,
+      onChange,
+      onBlur,
+      onFocus,
+      onKeyDown,
+      placeholder = "请选择",
+      "aria-label": ariaLabel,
+      "aria-describedby": ariaDescribedBy,
+      "aria-labelledby": ariaLabelledBy,
+    },
+    ref,
+  ) => {
+    const options = React.useMemo(() => extractOptions(children), [children]);
+
+    const normalizedValue = typeof value === "string" || typeof value === "number" ? String(value) : undefined;
+    const normalizedDefaultValue =
+      typeof defaultValue === "string" || typeof defaultValue === "number" ? String(defaultValue) : undefined;
+
+    const handleValueChange = React.useCallback(
+      (nextValue: string) => {
+        if (!onChange) return;
+
+        const syntheticEvent = {
+          target: { value: nextValue, name },
+          currentTarget: { value: nextValue, name },
+        } as React.ChangeEvent<HTMLSelectElement>;
+
+        onChange(syntheticEvent);
+      },
+      [name, onChange],
+    );
+
+    return (
+      <SelectPrimitive.Root
+        value={normalizedValue}
+        defaultValue={normalizedDefaultValue}
+        onValueChange={handleValueChange}
+        disabled={disabled}
+        name={name}
+        autoComplete={autoComplete}
+        required={required}
+        form={form}
+        dir={dir}
+      >
+        <SelectPrimitive.Trigger
+          ref={ref}
+          id={id}
+          className={cn(TRIGGER_BASE_CLASS, className)}
+          aria-label={ariaLabel}
+          aria-describedby={ariaDescribedBy}
+          aria-labelledby={ariaLabelledBy}
+          onBlur={onBlur}
+          onFocus={onFocus}
+          onKeyDown={onKeyDown}
+        >
+          <SelectPrimitive.Value placeholder={placeholder} />
+          <SelectPrimitive.Icon asChild>
+            <span className="pointer-events-none absolute right-2.5 top-1/2 flex h-6 w-6 -translate-y-1/2 items-center justify-center text-muted-foreground transition-all duration-200 ">
+              <ChevronDown className="h-5 w-5 transition-transform duration-200 group-data-[state=open]:rotate-180" />
+            </span>
+          </SelectPrimitive.Icon>
+        </SelectPrimitive.Trigger>
+
+        <SelectPrimitive.Portal>
+          <SelectPrimitive.Content
+            className={cn(CONTENT_BASE_CLASS, contentClassName)}
+            position="popper"
+            sideOffset={10}
+            collisionPadding={12}
+          >
+            <SelectPrimitive.ScrollUpButton className="flex h-8 cursor-default items-center justify-center rounded-md text-muted-foreground">
+              <ChevronUp className="h-4 w-4" />
+            </SelectPrimitive.ScrollUpButton>
+
+            <SelectPrimitive.Viewport className="p-0.5">
+              {options.map((option) => (
+                <SelectPrimitive.Item
+                  key={option.value}
+                  value={option.value}
+                  disabled={option.disabled}
+                  className={ITEM_BASE_CLASS}
+                  textValue={typeof option.label === "string" ? option.label : option.value}
+                >
+                  <SelectPrimitive.ItemText>{option.label}</SelectPrimitive.ItemText>
+                  <SelectPrimitive.ItemIndicator className="absolute right-3 inline-flex items-center justify-center text-primary">
+                    <Check className="h-4 w-4" />
+                  </SelectPrimitive.ItemIndicator>
+                </SelectPrimitive.Item>
+              ))}
+            </SelectPrimitive.Viewport>
+
+            <SelectPrimitive.ScrollDownButton className="flex h-8 cursor-default items-center justify-center rounded-md text-muted-foreground">
+              <ChevronDown className="h-4 w-4" />
+            </SelectPrimitive.ScrollDownButton>
+          </SelectPrimitive.Content>
+        </SelectPrimitive.Portal>
+      </SelectPrimitive.Root>
+    );
+  },
+);
+
+Select.displayName = "Select";
+
+export { Select };
diff --git a/frontend/src/components/ui/textarea.tsx b/frontend/src/components/ui/textarea.tsx
index 3e9dcf7..f4c0f9f 100644
--- a/frontend/src/components/ui/textarea.tsx
+++ b/frontend/src/components/ui/textarea.tsx
@@ -8,7 +8,7 @@ const Textarea = React.forwardRef<
   return (
     <textarea
       className={cn(
-        "flex min-h-[80px] w-full rounded-lg border border-input bg-background px-3 py-2 text-sm shadow-sm transition-all duration-200 placeholder:text-muted-foreground focus-visible:outline-none focus-visible:border-primary/50 hover:border-muted-foreground/30 disabled:cursor-not-allowed disabled:opacity-50",
+        "flex min-h-[80px] w-full rounded-lg border border-input px-3 py-2 text-sm shadow-sm transition-all duration-200 placeholder:text-muted-foreground focus-visible:outline-none focus-visible:border-primary/50 hover:border-muted-foreground/30 disabled:cursor-not-allowed disabled:opacity-50",
         className
       )}
       ref={ref}
diff --git a/frontend/src/pages/Channels.tsx b/frontend/src/pages/Channels.tsx
index 240b5f7..1ed5de6 100644
--- a/frontend/src/pages/Channels.tsx
+++ b/frontend/src/pages/Channels.tsx
@@ -814,7 +814,7 @@ export function Channels() {
                         />
                         <div>
                           <div className="text-sm font-medium">自动重试</div>
-                          <p className="text-xs text-muted-foreground">单个密钥遇可重试错误时，自动重试 x3</p>
+                          <p className="mt-1 text-xs text-muted-foreground">单个密钥遇可重试错误时，自动重试 x3</p>
                         </div>
                       </label>
                       <label className="flex items-start gap-3 p-4 rounded-lg border bg-muted/30 cursor-pointer">
@@ -825,7 +825,7 @@ export function Channels() {
                         />
                         <div>
                           <div className="text-sm font-medium">自动轮换</div>
-                          <p className="text-xs text-muted-foreground">单个密钥多次失败后，自动轮换密钥 x3</p>
+                          <p className="mt-1 text-xs text-muted-foreground">单个密钥多次失败后，自动轮换密钥 x3</p>
                         </div>
                       </label>
                     </div>
@@ -869,7 +869,7 @@ export function Channels() {
 
                   {modelEditorMode === 'visual' ? (
                     <div className="space-y-2">
-                      <div className="hidden md:grid md:grid-cols-[minmax(0,1fr)_minmax(0,1fr)_56px] md:gap-2 px-3 text-xs font-medium text-muted-foreground">
+                      <div className="hidden md:grid md:grid-cols-[minmax(0,1fr)_minmax(0,1fr)_56px] md:gap-2 text-xs font-medium text-muted-foreground">
                         <div>模型 ID</div>
                         <div>模型名称</div>
                         <div className="text-center">删除</div>
@@ -878,18 +878,18 @@ export function Channels() {
                         const canDelete = !isEmptyModelRow(row) || modelRows.length > 1
 
                         return (
-                          <div key={index} className="grid grid-cols-1 md:grid-cols-[minmax(0,1fr)_minmax(0,1fr)_56px] gap-2 p-3 bg-muted/40 rounded-lg">
+                          <div key={index} className="grid grid-cols-1 md:grid-cols-[minmax(0,1fr)_minmax(0,1fr)_56px] gap-2">
                             <Input
                               value={row.id}
                               onChange={(e) => updateModelRow(index, 'id', e.target.value)}
                               placeholder="模型ID，例如：gpt-4.1-mini"
-                              className="bg-background text-sm"
+                              className="text-sm"
                             />
                             <Input
                               value={row.name}
                               onChange={(e) => updateModelRow(index, 'name', e.target.value)}
                               placeholder="模型名称，默认等于模型ID"
-                              className="bg-background text-sm"
+                              className="text-sm"
                             />
                             <Button
                               type="button"
diff --git a/frontend/src/pages/Pricing.tsx b/frontend/src/pages/Pricing.tsx
index c6abfa2..586707b 100644
--- a/frontend/src/pages/Pricing.tsx
+++ b/frontend/src/pages/Pricing.tsx
@@ -181,7 +181,7 @@ export function Pricing() {
   return (
     <PageContainer
       title="定价管理"
-      description="配置模型使用成本倍率"
+      description="配置模型使用成本倍率，基础配额单位：1M tokens = $1.00"
       actions={
         <div className="flex items-center gap-2">
           <Button variant="outline" size="sm" onClick={() => refetch()} disabled={isFetching}>
@@ -198,15 +198,6 @@ export function Pricing() {
         </div>
       }
     >
-      {/* Info */}
-      <div className="mb-4 px-4 py-3 rounded-lg bg-muted/50 text-sm text-muted-foreground flex items-start gap-2.5">
-        <Info className="h-4 w-4 mt-0.5 flex-shrink-0 text-primary" />
-        <span>
-          基础配额单位：<span className="font-mono text-foreground">1M tokens = $1.00</span>。
-          倍率表示相对成本，如输入倍率 30 = 每百万 token 消耗 $30 配额。`按次` 为固定扣费，同样使用该配额单位，例如 15000 = $0.015 / 次。
-        </span>
-      </div>
-
       {editMode === 'table' ? (
         isLoading ? (
           <div className="flex items-center justify-center py-20">
@@ -216,12 +207,12 @@ export function Pricing() {
             </div>
           </div>
         ) : pricingRows.length === 0 ? (
-          <div className="rounded-xl border bg-white shadow-sm flex flex-col items-center justify-center py-16">
-            <div className="w-16 h-16 rounded-2xl bg-muted flex items-center justify-center mb-4">
-              <DollarSign className="h-8 w-8 text-muted-foreground" />
+          <div className="rounded-xl border bg-card shadow-sm flex flex-col items-center justify-center py-16">
+            <div className="w-14 h-14 rounded-2xl bg-primary/10 flex items-center justify-center mb-4">
+              <DollarSign className="h-7 w-7 text-primary" />
             </div>
             <h3 className="font-semibold text-lg mb-1">暂无定价配置</h3>
-            <p className="text-muted-foreground text-sm mb-4">添加模型定价倍率</p>
+            <p className="text-muted-foreground text-sm text-center max-w-sm mb-6">可调整倍率控制输入/输出成本，或者设置按次扣费。</p>
             <Button onClick={addRow}>
               <Plus className="h-4 w-4 mr-1" />
               添加模型