diff --git a/packages/ui/src/components/variable-extraction/VariableAwareInput.vue b/packages/ui/src/components/variable-extraction/VariableAwareInput.vue
index d7a300b0..40a940e1 100644
--- a/packages/ui/src/components/variable-extraction/VariableAwareInput.vue
+++ b/packages/ui/src/components/variable-extraction/VariableAwareInput.vue
@@ -57,6 +57,7 @@ import {
     variableHighlighter,
     variableAutocompletion,
     missingVariableTooltip,
+    existingVariableTooltip,
     createThemeExtension,
     type VariableDetectionLabels,
 } from "./codemirror-extensions";
@@ -132,6 +133,7 @@ let editorView: EditorView | null = null;
 const autocompletionCompartment = new Compartment();
 const highlighterCompartment = new Compartment();
 const missingVariableTooltipCompartment = new Compartment();
+const existingVariableTooltipCompartment = new Compartment();
 const placeholderCompartment = new Compartment();
 const themeCompartment = new Compartment();
 
@@ -503,6 +505,23 @@ onMounted(() => {
                     },
                 ),
             ),
+            // 已存在变量提示
+            existingVariableTooltipCompartment.of(
+                existingVariableTooltip(
+                    variableDetectionLabels.value,
+                    {
+                        backgroundColor: themeVars.value.cardColor,
+                        borderColor: themeVars.value.borderColor,
+                        borderRadius: themeVars.value.borderRadius,
+                        textColor: themeVars.value.textColor2,
+                        shadow: themeVars.value.boxShadow2,
+                        sourceGlobalColor: themeVars.value.infoColor,
+                        sourceTemporaryColor: themeVars.value.successColor,
+                        sourcePredefinedColor: themeVars.value.warningColor,
+                        surfaceOverlay: themeVars.value.popoverColor,
+                    },
+                ),
+            ),
             // 主题适配
             themeCompartment.of(createThemeExtension(themeVars.value)),
             // 监听文档变化
@@ -586,6 +605,22 @@ watch(
                         },
                     ),
                 ),
+                existingVariableTooltipCompartment.reconfigure(
+                    existingVariableTooltip(
+                        variableDetectionLabels.value,
+                        {
+                            backgroundColor: themeVars.value.cardColor,
+                            borderColor: themeVars.value.borderColor,
+                            borderRadius: themeVars.value.borderRadius,
+                            textColor: themeVars.value.textColor2,
+                            shadow: themeVars.value.boxShadow2,
+                            sourceGlobalColor: themeVars.value.infoColor,
+                            sourceTemporaryColor: themeVars.value.successColor,
+                            sourcePredefinedColor: themeVars.value.warningColor,
+                            surfaceOverlay: themeVars.value.popoverColor,
+                        },
+                    ),
+                ),
             ],
         });
     },
@@ -618,6 +653,36 @@ watch(
         editorView.dispatch({
             effects: [
                 themeCompartment.reconfigure(createThemeExtension(vars)),
+                missingVariableTooltipCompartment.reconfigure(
+                    missingVariableTooltip(
+                        handleAddMissingVariable,
+                        variableDetectionLabels.value,
+                        {
+                            backgroundColor: vars.cardColor,
+                            borderColor: vars.borderColor,
+                            borderRadius: vars.borderRadius,
+                            textColor: vars.textColor2,
+                            primaryColor: vars.primaryColor,
+                            primaryColorHover: vars.primaryColorHover,
+                        },
+                    ),
+                ),
+                existingVariableTooltipCompartment.reconfigure(
+                    existingVariableTooltip(
+                        variableDetectionLabels.value,
+                        {
+                            backgroundColor: vars.cardColor,
+                            borderColor: vars.borderColor,
+                            borderRadius: vars.borderRadius,
+                            textColor: vars.textColor2,
+                            shadow: vars.boxShadow2,
+                            sourceGlobalColor: vars.infoColor,
+                            sourceTemporaryColor: vars.successColor,
+                            sourcePredefinedColor: vars.warningColor,
+                            surfaceOverlay: vars.popoverColor,
+                        },
+                    ),
+                ),
             ],
         });
     },
diff --git a/packages/ui/src/components/variable-extraction/codemirror-extensions.ts b/packages/ui/src/components/variable-extraction/codemirror-extensions.ts
index 7c28938e..b80dc429 100644
--- a/packages/ui/src/components/variable-extraction/codemirror-extensions.ts
+++ b/packages/ui/src/components/variable-extraction/codemirror-extensions.ts
@@ -30,6 +30,115 @@ export interface MissingVariableTooltipTheme {
   primaryColorHover?: string
 }
 
+export interface ExistingVariableTooltipTheme extends MissingVariableTooltipTheme {
+  shadow?: string
+  sourceGlobalColor?: string
+  sourceTemporaryColor?: string
+  sourcePredefinedColor?: string
+  surfaceOverlay?: string
+}
+
+type RgbTuple = {
+  r: number
+  g: number
+  b: number
+}
+
+function parseColor(color: string | undefined | null): RgbTuple | null {
+  if (!color) return null
+
+  const normalized = color.trim().toLowerCase()
+  if (normalized.startsWith('#')) {
+    const hex = normalized.slice(1)
+    if (hex.length === 3) {
+      return {
+        r: Number.parseInt(hex[0] + hex[0], 16),
+        g: Number.parseInt(hex[1] + hex[1], 16),
+        b: Number.parseInt(hex[2] + hex[2], 16)
+      }
+    }
+    if (hex.length === 6 || hex.length === 8) {
+      return {
+        r: Number.parseInt(hex.slice(0, 2), 16),
+        g: Number.parseInt(hex.slice(2, 4), 16),
+        b: Number.parseInt(hex.slice(4, 6), 16)
+      }
+    }
+    return null
+  }
+
+  const rgbMatch = normalized.match(/rgba?\((\d+),\s*(\d+),\s*(\d+)/)
+  if (rgbMatch) {
+    return {
+      r: Number.parseInt(rgbMatch[1], 10),
+      g: Number.parseInt(rgbMatch[2], 10),
+      b: Number.parseInt(rgbMatch[3], 10)
+    }
+  }
+
+  return null
+}
+
+function toHex({ r, g, b }: RgbTuple): string {
+  const clamp = (value: number) => Math.max(0, Math.min(255, Math.round(value)))
+  return `#${clamp(r).toString(16).padStart(2, '0')}${clamp(g).toString(16).padStart(2, '0')}${clamp(b)
+    .toString(16)
+    .padStart(2, '0')}`
+}
+
+function mixColors(source: RgbTuple, target: RgbTuple, ratio: number): RgbTuple {
+  const resolved = Math.max(0, Math.min(1, ratio))
+  return {
+    r: source.r + (target.r - source.r) * resolved,
+    g: source.g + (target.g - source.g) * resolved,
+    b: source.b + (target.b - source.b) * resolved
+  }
+}
+
+function withAlpha(color: string | undefined, alpha: number, fallback: string): string {
+  const parsed = parseColor(color)
+  if (!parsed) return fallback
+  const resolvedAlpha = Math.max(0, Math.min(1, alpha))
+  return `rgba(${parsed.r}, ${parsed.g}, ${parsed.b}, ${resolvedAlpha})`
+}
+
+function getLuminance({ r, g, b }: RgbTuple): number {
+  return 0.2126 * r + 0.7152 * g + 0.0722 * b
+}
+
+function getReadableTextColor(
+  baseColor: string | undefined,
+  fallbackColor: string,
+  isDark: boolean
+): string {
+  const parsedBase = parseColor(baseColor)
+  if (!parsedBase) return fallbackColor
+
+  const baseLuminance = getLuminance(parsedBase)
+  if (isDark && baseLuminance < 200) {
+    return toHex(mixColors(parsedBase, { r: 255, g: 255, b: 255 }, 0.4))
+  }
+  if (!isDark && baseLuminance > 160) {
+    return toHex(mixColors(parsedBase, { r: 0, g: 0, b: 0 }, 0.3))
+  }
+
+  return toHex(parsedBase)
+}
+
+function detectIsDarkTheme(themeVars: ThemeCommonVars): boolean {
+  const cardRgb = parseColor(themeVars.cardColor)
+  if (cardRgb) {
+    return getLuminance(cardRgb) < 128
+  }
+
+  const primaryText = parseColor(themeVars.textColor1)
+  if (primaryText) {
+    return getLuminance(primaryText) > 180
+  }
+
+  return false
+}
+
 /** 变量名允许的字符集合 (支持 Unicode 字母与数字与分隔符) */
 const VARIABLE_CHAR_CLASS = '[\\p{L}\\p{N}_\\-.]'
 const VARIABLE_TRIGGER_REGEX = new RegExp(`\\{\\{${VARIABLE_CHAR_CLASS}*`, 'u')
@@ -166,6 +275,160 @@ export function variableAutocompletion(
   })
 }
 
+/**
+ * 已存在变量悬浮提示扩展
+ *
+ * 当鼠标悬停在已存在的变量上时,显示变量来源标签和变量值
+ */
+export function existingVariableTooltip(
+  labels: VariableDetectionLabels,
+  theme: ExistingVariableTooltipTheme = {}
+) {
+  return hoverTooltip((view, pos, _side) => {
+    const { node } = view.domAtPos(pos)
+    const element = node instanceof Element ? node : node.parentElement
+
+    if (!element) return null
+
+    const isExisting =
+      element.classList?.contains('cm-variable-global') ||
+      element.classList?.contains('cm-variable-temporary') ||
+      element.classList?.contains('cm-variable-predefined') ||
+      element.parentElement?.classList?.contains('cm-variable-global') ||
+      element.parentElement?.classList?.contains('cm-variable-temporary') ||
+      element.parentElement?.classList?.contains('cm-variable-predefined')
+
+    if (!isExisting) return null
+
+    const targetElement = element.classList?.contains('cm-variable-global') ||
+                         element.classList?.contains('cm-variable-temporary') ||
+                         element.classList?.contains('cm-variable-predefined')
+      ? element
+      : element.parentElement
+
+    if (!targetElement) return null
+
+    const varName = targetElement.getAttribute('data-variable-name')
+    const varSource = targetElement.getAttribute('data-variable-source')
+    const varValue = targetElement.getAttribute('data-variable-value') || ''
+
+    if (!varName || !varSource) return null
+
+    const accentColorMap: Record<string, string> = {
+      global: theme.sourceGlobalColor || '#2080f0',
+      temporary: theme.sourceTemporaryColor || '#18a058',
+      predefined: theme.sourcePredefinedColor || '#8a63d2'
+    }
+
+    const accentColor = accentColorMap[varSource] || '#2080f0'
+    const surfaceOverlay =
+      theme.surfaceOverlay || withAlpha(theme.backgroundColor, 0.92, '#ffffff')
+    const shadow = theme.shadow || '0 12px 32px rgba(15, 23, 42, 0.18)'
+
+    const text = view.state.doc.toString()
+    const escapedVarName = varName.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+    const regex = new RegExp(`\\{\\{${escapedVarName}\\}\\}`, 'gu')
+    let match
+    let varFrom = -1
+    let varTo = -1
+
+    while ((match = regex.exec(text)) !== null) {
+      const matchFrom = match.index
+      const matchTo = matchFrom + match[0].length
+      if (pos >= matchFrom && pos <= matchTo) {
+        varFrom = matchFrom
+        varTo = matchTo
+        break
+      }
+    }
+
+    if (varFrom === -1) return null
+
+    return {
+      pos: varFrom,
+      end: varTo,
+      above: true,
+      create() {
+        const dom = document.createElement('div')
+        dom.className = 'cm-existing-variable-tooltip-container'
+
+        const borderColor = theme.borderColor || withAlpha(accentColor, 0.18, '#dcdcdc')
+        const borderRadius = theme.borderRadius || '12px'
+        const textColor = theme.textColor || '#4c4f69'
+
+        dom.style.padding = '12px 16px'
+        dom.style.background = surfaceOverlay
+        dom.style.border = `1px solid ${borderColor}`
+        dom.style.borderRadius = borderRadius
+        dom.style.boxShadow = shadow
+        dom.style.fontSize = '13px'
+        dom.style.color = textColor
+        dom.style.maxWidth = '420px'
+        dom.style.lineHeight = '1.6'
+        const sourceLabelText =
+          varSource === 'global'
+            ? labels.sourceGlobal
+            : varSource === 'temporary'
+              ? labels.sourceTemporary
+              : labels.sourcePredefined
+
+        const sourceTag = document.createElement('span')
+        sourceTag.style.fontSize = '11px'
+        sourceTag.style.fontWeight = '600'
+        sourceTag.style.padding = '2px 8px'
+        sourceTag.style.borderRadius = '999px'
+        sourceTag.style.background = withAlpha(accentColor, 0.1, '#eaf4ff')
+        sourceTag.style.color = accentColor
+        sourceTag.style.border = `1px solid ${withAlpha(accentColor, 0.25, accentColor)}`
+        sourceTag.textContent = sourceLabelText
+        sourceTag.style.alignSelf = 'flex-start'
+        sourceTag.style.display = 'inline-flex'
+        sourceTag.style.alignItems = 'center'
+        dom.style.display = 'flex'
+        dom.style.flexDirection = 'column'
+        dom.style.gap = '8px'
+        dom.appendChild(sourceTag)
+
+        const valueSection = document.createElement('div')
+        valueSection.style.display = 'flex'
+        valueSection.style.flexDirection = 'column'
+        valueSection.style.gap = '6px'
+        valueSection.style.padding = '10px 12px'
+        valueSection.style.background = withAlpha(accentColor, 0.08, 'rgba(0, 0, 0, 0.04)')
+        valueSection.style.borderRadius = '8px'
+        valueSection.style.border = `1px solid ${withAlpha(accentColor, 0.18, borderColor)}`
+
+        const valueElement = document.createElement('div')
+        valueElement.style.fontSize = '13px'
+        valueElement.style.color = textColor
+        valueElement.style.fontWeight = '500'
+        valueElement.style.whiteSpace = 'pre-wrap'
+        valueElement.style.wordBreak = 'break-word'
+        valueElement.style.maxHeight = '180px'
+        valueElement.style.overflowY = 'auto'
+        valueElement.style.fontFamily =
+          'var(--n-font-mono, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace)'
+
+        if (varValue.trim()) {
+          valueElement.style.fontStyle = 'normal'
+          valueElement.style.opacity = '1'
+          valueElement.textContent = varValue
+        } else {
+          valueElement.style.fontWeight = '400'
+          valueElement.style.fontStyle = 'italic'
+          valueElement.style.opacity = '0.7'
+          valueElement.textContent = labels.emptyValue
+        }
+
+        valueSection.appendChild(valueElement)
+        dom.appendChild(valueSection)
+
+        return { dom }
+      }
+    }
+  })
+}
+
 /**
  * 缺失变量悬浮提示扩展
  *
@@ -280,8 +543,70 @@ export function missingVariableTooltip(
 
 /**
  * 主题扩展 - 适配 Naive UI 主题
+ * 根据亮色/暗色主题动态调整变量高亮颜色,确保可读性
  */
 export function createThemeExtension(themeVars: ThemeCommonVars) {
+  const isDark = detectIsDarkTheme(themeVars)
+
+  const fallbackSurface = isDark ? 'rgba(255, 255, 255, 0.08)' : 'rgba(0, 0, 0, 0.05)'
+  const fallbackText = themeVars.textColor1 || (isDark ? '#ffffff' : '#1f1f1f')
+
+  const highlightColors = {
+    global: {
+      backgroundColor: withAlpha(
+        themeVars.infoColorSuppl ?? themeVars.infoColor ?? themeVars.primaryColor,
+        isDark ? 0.3 : 0.16,
+        fallbackSurface
+      ),
+      color: `${getReadableTextColor(
+        themeVars.infoColorSuppl ?? themeVars.infoColor ?? themeVars.primaryColor,
+        fallbackText,
+        isDark
+      )} !important`
+    },
+    temporary: {
+      backgroundColor: withAlpha(
+        themeVars.successColorSuppl ?? themeVars.successColor ?? themeVars.primaryColor,
+        isDark ? 0.3 : 0.16,
+        fallbackSurface
+      ),
+      color: `${getReadableTextColor(
+        themeVars.successColorSuppl ?? themeVars.successColor ?? themeVars.primaryColor,
+        fallbackText,
+        isDark
+      )} !important`
+    },
+    predefined: {
+      backgroundColor: withAlpha(
+        themeVars.primaryColorSuppl ?? themeVars.primaryColor,
+        isDark ? 0.3 : 0.16,
+        fallbackSurface
+      ),
+      color: `${getReadableTextColor(
+        themeVars.primaryColorSuppl ?? themeVars.primaryColor,
+        fallbackText,
+        isDark
+      )} !important`
+    },
+    missing: {
+      backgroundColor: withAlpha(
+        themeVars.errorColorSuppl ?? themeVars.errorColor,
+        isDark ? 0.32 : 0.18,
+        isDark ? 'rgba(248, 113, 113, 0.28)' : 'rgba(248, 113, 113, 0.16)'
+      ),
+      color: `${getReadableTextColor(
+        themeVars.errorColorSuppl ?? themeVars.errorColor,
+        fallbackText,
+        isDark
+      )} !important`
+    },
+    activeLine: withAlpha(
+      isDark ? themeVars.textColor1 : themeVars.primaryColorSuppl ?? themeVars.primaryColor,
+      isDark ? 0.12 : 0.08,
+      isDark ? 'rgba(255, 255, 255, 0.08)' : themeVars.hoverColor ?? 'rgba(0, 0, 0, 0.05)'
+    )
+  }
+
   return EditorView.theme({
     '&': {
       backgroundColor: themeVars.cardColor,
@@ -305,33 +630,45 @@ export function createThemeExtension(themeVars: ThemeCommonVars) {
       backgroundColor: themeVars.primaryColorSuppl + '60' // 60% opacity
     },
     '.cm-activeLine': {
-      backgroundColor: themeVars.hoverColor
+      backgroundColor: highlightColors.activeLine
+    },
+    '.cm-activeLineGutter': {
+      backgroundColor: highlightColors.activeLine,
+      color: themeVars.textColor1
     },
     '.cm-gutters': {
       backgroundColor: themeVars.cardColor,
       color: themeVars.textColor3,
       border: 'none'
     },
-    // 变量高亮样式
+    // 变量高亮样式 - 根据主题动态调整背景色和文字颜色
     '.cm-variable-global': {
-      backgroundColor: '#e6f7ff',
-      borderRadius: '2px',
-      padding: '0 2px'
-    },
-    '.cm-variable-temporary': {
-      backgroundColor: '#f6ffed',
-      borderRadius: '2px',
-      padding: '0 2px'
-    },
-    '.cm-variable-predefined': {
-      backgroundColor: '#f9f0ff',
-      borderRadius: '2px',
-      padding: '0 2px'
-    },
-    '.cm-variable-missing': {
-      backgroundColor: '#fff1f0',
+      backgroundColor: highlightColors.global.backgroundColor,
+      color: highlightColors.global.color,
       borderRadius: '2px',
       padding: '0 2px',
+      fontWeight: '500'
+    },
+    '.cm-variable-temporary': {
+      backgroundColor: highlightColors.temporary.backgroundColor,
+      color: highlightColors.temporary.color,
+      borderRadius: '2px',
+      padding: '0 2px',
+      fontWeight: '500'
+    },
+    '.cm-variable-predefined': {
+      backgroundColor: highlightColors.predefined.backgroundColor,
+      color: highlightColors.predefined.color,
+      borderRadius: '2px',
+      padding: '0 2px',
+      fontWeight: '500'
+    },
+    '.cm-variable-missing': {
+      backgroundColor: highlightColors.missing.backgroundColor,
+      color: highlightColors.missing.color,
+      borderRadius: '2px',
+      padding: '0 2px',
+      fontWeight: '500',
       textDecoration: 'underline wavy red',
       textDecorationThickness: '2px',
       textUnderlineOffset: '2px'