diff --git a/frontend/src/api/cache.ts b/frontend/src/api/cache.ts
index c8d3b59..6960fe6 100644
--- a/frontend/src/api/cache.ts
+++ b/frontend/src/api/cache.ts
@@ -220,6 +220,7 @@ export interface IntervalTimelinePoint {
   x: string  // ISO 时间字符串
   y: number  // 间隔分钟数
   user_id?: string  // 用户 ID（仅 include_user_info=true 时存在）
+  model?: string  // 模型名称
 }
 
 export interface IntervalTimelineResponse {
@@ -227,6 +228,7 @@ export interface IntervalTimelineResponse {
   total_points: number
   points: IntervalTimelinePoint[]
   users?: Record<string, string>  // user_id -> username 映射（仅 include_user_info=true 时存在）
+  models?: string[]  // 出现的模型列表
 }
 
 export const cacheAnalysisApi = {
diff --git a/frontend/src/api/me.ts b/frontend/src/api/me.ts
index 7d2b5c3..bbb6e93 100644
--- a/frontend/src/api/me.ts
+++ b/frontend/src/api/me.ts
@@ -262,7 +262,8 @@ export const meApi = {
   }): Promise<{
     analysis_period_hours: number
     total_points: number
-    points: Array<{ x: string; y: number }>
+    points: Array<{ x: string; y: number; model?: string }>
+    models?: string[]
   }> {
     const response = await apiClient.get('/api/users/me/usage/interval-timeline', { params })
     return response.data
diff --git a/frontend/src/components/charts/ScatterChart.vue b/frontend/src/components/charts/ScatterChart.vue
index 24e43e4..3ecd639 100644
--- a/frontend/src/components/charts/ScatterChart.vue
+++ b/frontend/src/components/charts/ScatterChart.vue
@@ -6,9 +6,32 @@
       class="absolute top-2 right-2 bg-gray-800/90 text-gray-100 px-3 py-2 rounded-lg text-sm shadow-lg border border-gray-600"
     >
       <div class="font-medium text-yellow-400">Y = {{ crosshairStats.yValue.toFixed(1) }} 分钟</div>
-      <div class="mt-1">
-        <span class="text-green-400">{{ crosshairStats.belowCount }}</span> / {{ crosshairStats.totalCount }} 点在横线以下
-        <span class="ml-2 text-blue-400">({{ crosshairStats.belowPercent.toFixed(1) }}%)</span>
+      <!-- 单个 dataset 时显示简单统计 -->
+      <div v-if="crosshairStats.datasets.length === 1" class="mt-1">
+        <span class="text-green-400">{{ crosshairStats.datasets[0].belowCount }}</span> / {{ crosshairStats.datasets[0].totalCount }} 点在横线以下
+        <span class="ml-2 text-blue-400">({{ crosshairStats.datasets[0].belowPercent.toFixed(1) }}%)</span>
+      </div>
+      <!-- 多个 dataset 时按模型分别显示 -->
+      <div v-else class="mt-1 space-y-0.5">
+        <div
+          v-for="ds in crosshairStats.datasets"
+          :key="ds.label"
+          class="flex items-center gap-2"
+        >
+          <div
+            class="w-2 h-2 rounded-full flex-shrink-0"
+            :style="{ backgroundColor: ds.color }"
+          />
+          <span class="text-gray-300 truncate max-w-[80px]">{{ ds.label }}:</span>
+          <span class="text-green-400">{{ ds.belowCount }}</span>/<span class="text-gray-400">{{ ds.totalCount }}</span>
+          <span class="text-blue-400">({{ ds.belowPercent.toFixed(0) }}%)</span>
+        </div>
+        <!-- 总计 -->
+        <div class="flex items-center gap-2 pt-1 border-t border-gray-600 mt-1">
+          <span class="text-gray-300">总计:</span>
+          <span class="text-green-400">{{ crosshairStats.totalBelowCount }}</span>/<span class="text-gray-400">{{ crosshairStats.totalCount }}</span>
+          <span class="text-blue-400">({{ crosshairStats.totalBelowPercent.toFixed(1) }}%)</span>
+        </div>
       </div>
     </div>
   </div>
@@ -48,13 +71,22 @@ interface Props {
   height?: number
 }
 
-interface CrosshairStats {
-  yValue: number
+interface DatasetStats {
+  label: string
+  color: string
   belowCount: number
   totalCount: number
   belowPercent: number
 }
 
+interface CrosshairStats {
+  yValue: number
+  datasets: DatasetStats[]
+  totalBelowCount: number
+  totalCount: number
+  totalBelowPercent: number
+}
+
 const props = withDefaults(defineProps<Props>(), {
   height: 300
 })
@@ -67,29 +99,47 @@ const crosshairY = ref<number | null>(null)
 const crosshairStats = computed<CrosshairStats | null>(() => {
   if (crosshairY.value === null || !props.data.datasets) return null
 
+  const datasetStats: DatasetStats[] = []
+  let totalBelowCount = 0
   let totalCount = 0
-  let belowCount = 0
 
   for (const dataset of props.data.datasets) {
     if (!dataset.data) continue
+
+    let belowCount = 0
+    let dsTotal = 0
+
     for (const point of dataset.data) {
       const p = point as { x: string; y: number }
       if (typeof p.y === 'number') {
+        dsTotal++
         totalCount++
         if (p.y <= crosshairY.value) {
           belowCount++
+          totalBelowCount++
         }
       }
     }
+
+    if (dsTotal > 0) {
+      datasetStats.push({
+        label: dataset.label || 'Unknown',
+        color: (dataset.backgroundColor as string) || 'rgba(59, 130, 246, 0.7)',
+        belowCount,
+        totalCount: dsTotal,
+        belowPercent: (belowCount / dsTotal) * 100
+      })
+    }
   }
 
   if (totalCount === 0) return null
 
   return {
     yValue: crosshairY.value,
-    belowCount,
+    datasets: datasetStats,
+    totalBelowCount,
     totalCount,
-    belowPercent: (belowCount / totalCount) * 100
+    totalBelowPercent: (totalBelowCount / totalCount) * 100
   }
 })
 
diff --git a/frontend/src/features/usage/components/IntervalTimelineCard.vue b/frontend/src/features/usage/components/IntervalTimelineCard.vue
index 05b7bab..357dcc0 100644
--- a/frontend/src/features/usage/components/IntervalTimelineCard.vue
+++ b/frontend/src/features/usage/components/IntervalTimelineCard.vue
@@ -2,18 +2,21 @@
   <Card class="p-4">
     <div class="flex items-center justify-between mb-3">
       <p class="text-sm font-semibold">{{ title }}</p>
-      <div v-if="hasMultipleUsers && userLegend.length > 0" class="flex items-center gap-2 flex-wrap justify-end text-[11px]">
+      <div v-if="displayLegendItems.length > 0" class="flex items-center gap-2 flex-wrap justify-end text-[11px]">
         <div
-          v-for="user in userLegend"
-          :key="user.id"
+          v-for="item in displayLegendItems"
+          :key="item.id"
           class="flex items-center gap-1"
         >
           <div
             class="w-2.5 h-2.5 rounded-full"
-            :style="{ backgroundColor: user.color }"
+            :style="{ backgroundColor: item.color }"
           />
-          <span class="text-muted-foreground">{{ user.name }}</span>
+          <span class="text-muted-foreground">{{ item.name }}</span>
         </div>
+        <span v-if="hiddenLegendCount > 0" class="text-muted-foreground">
+          +{{ hiddenLegendCount }} 更多
+        </span>
       </div>
     </div>
     <div v-if="loading" class="h-[160px] flex items-center justify-center">
@@ -63,8 +66,8 @@ onMounted(() => {
   loadData()
 })
 
-// 预定义的颜色列表（用于区分不同用户）
-const USER_COLORS = [
+// 预定义的颜色列表（用于区分不同用户/模型）
+const COLORS = [
   'rgba(59, 130, 246, 0.7)',   // blue
   'rgba(236, 72, 153, 0.7)',   // pink
   'rgba(34, 197, 94, 0.7)',    // green
@@ -81,22 +84,72 @@ const hasData = computed(() =>
   timelineData.value && timelineData.value.points && timelineData.value.points.length > 0
 )
 
-const hasMultipleUsers = computed(() =>
-  props.isAdmin && timelineData.value?.users && Object.keys(timelineData.value.users).length > 1
-)
-
-// 用户图例
-const userLegend = computed(() => {
-  if (!props.isAdmin || !timelineData.value?.users) return []
-
-  const users = Object.entries(timelineData.value.users)
-  return users.map(([userId, username], index) => ({
-    id: userId,
-    name: username || userId.slice(0, 8),
-    color: USER_COLORS[index % USER_COLORS.length]
-  }))
+// 判断是否有多个分组（管理员按用户分组，普通用户按模型分组）
+const hasMultipleGroups = computed(() => {
+  if (props.isAdmin) {
+    // 管理员视图：按用户分组
+    return timelineData.value?.users && Object.keys(timelineData.value.users).length > 1
+  } else {
+    // 用户视图：按模型分组
+    return timelineData.value?.models && timelineData.value.models.length > 1
+  }
 })
 
+// 图例最多显示数量
+const MAX_LEGEND_ITEMS = 6
+
+// 图例项（管理员显示用户，普通用户显示模型）
+const legendItems = computed(() => {
+  if (props.isAdmin && timelineData.value?.users) {
+    // 管理员视图：显示用户图例
+    const users = Object.entries(timelineData.value.users)
+    if (users.length <= 1) return []
+    return users.map(([userId, username], index) => ({
+      id: userId,
+      name: username || userId.slice(0, 8),
+      color: COLORS[index % COLORS.length]
+    }))
+  } else if (timelineData.value?.models && timelineData.value.models.length > 1) {
+    // 用户视图：显示模型图例
+    return timelineData.value.models.map((model, index) => ({
+      id: model,
+      name: formatModelName(model),
+      color: COLORS[index % COLORS.length]
+    }))
+  }
+  return []
+})
+
+// 显示的图例项（限制数量）
+const displayLegendItems = computed(() => {
+  return legendItems.value.slice(0, MAX_LEGEND_ITEMS)
+})
+
+// 隐藏的图例数量
+const hiddenLegendCount = computed(() => {
+  return Math.max(0, legendItems.value.length - MAX_LEGEND_ITEMS)
+})
+
+// 格式化模型名称，使其更简洁
+function formatModelName(model: string): string {
+  // 常见的简化规则
+  if (model.includes('claude')) {
+    // claude-3-5-sonnet-20241022 -> Claude 3.5 Sonnet
+    const match = model.match(/claude-(\d+)-(\d+)?-?(\w+)?/i)
+    if (match) {
+      const major = match[1]
+      const minor = match[2]
+      const variant = match[3]
+      let name = `Claude ${major}`
+      if (minor) name += `.${minor}`
+      if (variant) name += ` ${variant.charAt(0).toUpperCase() + variant.slice(1)}`
+      return name
+    }
+  }
+  // 其他模型保持原样但截断
+  return model.length > 20 ? model.slice(0, 17) + '...' : model
+}
+
 // 构建图表数据
 const chartData = computed<ChartData<'scatter'>>(() => {
   if (!timelineData.value?.points) {
@@ -105,12 +158,12 @@ const chartData = computed<ChartData<'scatter'>>(() => {
 
   const points = timelineData.value.points
 
-  // 如果是管理员且有多个用户，按用户分组
+  // 管理员视图且有多个用户：按用户分组
   if (props.isAdmin && timelineData.value.users && Object.keys(timelineData.value.users).length > 1) {
     const userIds = Object.keys(timelineData.value.users)
     const userColorMap: Record<string, string> = {}
     userIds.forEach((userId, index) => {
-      userColorMap[userId] = USER_COLORS[index % USER_COLORS.length]
+      userColorMap[userId] = COLORS[index % COLORS.length]
     })
 
     // 按用户分组数据
@@ -136,7 +189,38 @@ const chartData = computed<ChartData<'scatter'>>(() => {
     return { datasets }
   }
 
-  // 单用户或用户视图：使用主题色
+  // 用户视图且有多个模型：按模型分组
+  if (!props.isAdmin && timelineData.value.models && timelineData.value.models.length > 1) {
+    const models = timelineData.value.models
+    const modelColorMap: Record<string, string> = {}
+    models.forEach((model, index) => {
+      modelColorMap[model] = COLORS[index % COLORS.length]
+    })
+
+    // 按模型分组数据
+    const groupedData: Record<string, Array<{ x: string; y: number }>> = {}
+    for (const point of points) {
+      const model = point.model || 'unknown'
+      if (!groupedData[model]) {
+        groupedData[model] = []
+      }
+      groupedData[model].push({ x: point.x, y: point.y })
+    }
+
+    // 创建每个模型的 dataset
+    const datasets = Object.entries(groupedData).map(([model, data]) => ({
+      label: formatModelName(model),
+      data,
+      backgroundColor: modelColorMap[model] || 'rgba(59, 130, 246, 0.6)',
+      borderColor: modelColorMap[model] || 'rgba(59, 130, 246, 0.8)',
+      pointRadius: 3,
+      pointHoverRadius: 5,
+    }))
+
+    return { datasets }
+  }
+
+  // 单用户或单模型：使用主题色
   return {
     datasets: [{
       label: '请求间隔',
@@ -160,7 +244,7 @@ const chartOptions = computed<ChartOptions<'scatter'>>(() => ({
           const point = context.raw as { x: string; y: number; _originalY?: number }
           const realY = point._originalY ?? point.y
           const datasetLabel = context.dataset.label || ''
-          if (props.isAdmin && hasMultipleUsers.value) {
+          if (hasMultipleGroups.value) {
             return `${datasetLabel}: ${realY.toFixed(1)} 分钟`
           }
           return `间隔: ${realY.toFixed(1)} 分钟`
diff --git a/frontend/src/mocks/handler.ts b/frontend/src/mocks/handler.ts
index 1ac493c..c6f620b 100644
--- a/frontend/src/mocks/handler.ts
+++ b/frontend/src/mocks/handler.ts
@@ -2166,7 +2166,7 @@ function generateIntervalTimelineData(
 ) {
   const now = Date.now()
   const startTime = now - hours * 60 * 60 * 1000
-  const points: Array<{ x: string; y: number; user_id?: string }> = []
+  const points: Array<{ x: string; y: number; user_id?: string; model?: string }> = []
 
   // 用户列表（用于管理员视图）
   const users = [
@@ -2176,6 +2176,14 @@ function generateIntervalTimelineData(
     { id: 'demo-user-uuid-0004', username: 'Bob Zhang' }
   ]
 
+  // 模型列表（用于按模型区分颜色）
+  const models = [
+    'claude-sonnet-4-20250514',
+    'claude-3-5-sonnet-20241022',
+    'claude-3-5-haiku-20241022',
+    'claude-opus-4-20250514'
+  ]
+
   // 生成模拟的请求间隔数据
   // 间隔时间分布：大部分在 0-10 分钟，少量在 10-60 分钟，极少数在 60-120 分钟
   const pointCount = Math.min(limit, Math.floor(hours * 80)) // 每小时约 80 个数据点
@@ -2211,9 +2219,10 @@ function generateIntervalTimelineData(
     // 确保间隔不超过 120 分钟
     interval = Math.min(interval, 120)
 
-    const point: { x: string; y: number; user_id?: string } = {
+    const point: { x: string; y: number; user_id?: string; model?: string } = {
       x: new Date(currentTime).toISOString(),
-      y: Math.round(interval * 100) / 100
+      y: Math.round(interval * 100) / 100,
+      model: models[Math.floor(Math.random() * models.length)]
     }
 
     if (includeUserInfo) {
@@ -2231,15 +2240,20 @@ function generateIntervalTimelineData(
   // 按时间排序
   points.sort((a, b) => new Date(a.x).getTime() - new Date(b.x).getTime())
 
+  // 收集出现的模型
+  const usedModels = [...new Set(points.map(p => p.model).filter(Boolean))] as string[]
+
   const response: {
     analysis_period_hours: number
     total_points: number
     points: typeof points
     users?: Record<string, string>
+    models?: string[]
   } = {
     analysis_period_hours: hours,
     total_points: points.length,
-    points
+    points,
+    models: usedModels
   }
 
   if (includeUserInfo) {
diff --git a/src/services/usage/service.py b/src/services/usage/service.py
index 135b83e..6605616 100644
--- a/src/services/usage/service.py
+++ b/src/services/usage/service.py
@@ -1746,7 +1746,7 @@ class UsageService:
             include_user_info: 是否包含用户信息（用于管理员多用户视图）
 
         Returns:
-            包含时间线数据点的字典
+            包含时间线数据点的字典，每个数据点包含 model 字段用于按模型区分颜色
         """
         from sqlalchemy import text
 
@@ -1764,6 +1764,7 @@ class UsageService:
                     SELECT
                         u.created_at,
                         u.user_id,
+                        u.model,
                         usr.username,
                         LAG(u.created_at) OVER (
                             PARTITION BY u.user_id
@@ -1780,6 +1781,7 @@ class UsageService:
                     SELECT
                         created_at,
                         user_id,
+                        model,
                         username,
                         EXTRACT(EPOCH FROM (created_at - prev_request_at)) / 60.0 as interval_minutes,
                         ROW_NUMBER() OVER (PARTITION BY user_id ORDER BY created_at) as rn
@@ -1804,6 +1806,7 @@ class UsageService:
                 SELECT
                     fi.created_at,
                     fi.user_id,
+                    fi.model,
                     fi.username,
                     fi.interval_minutes
                 FROM filtered_intervals fi
@@ -1812,12 +1815,13 @@ class UsageService:
                 ORDER BY fi.created_at
             """)
         else:
-            # 普通视图：只返回时间和间隔
+            # 普通视图：返回时间、间隔和模型信息
             sql = text(f"""
                 WITH request_intervals AS (
                     SELECT
                         u.created_at,
                         u.user_id,
+                        u.model,
                         LAG(u.created_at) OVER (
                             PARTITION BY u.user_id
                             ORDER BY u.created_at
@@ -1830,6 +1834,7 @@ class UsageService:
                 )
                 SELECT
                     created_at,
+                    model,
                     EXTRACT(EPOCH FROM (created_at - prev_request_at)) / 60.0 as interval_minutes
                 FROM request_intervals
                 WHERE prev_request_at IS NOT NULL
@@ -1848,24 +1853,33 @@ class UsageService:
         # 转换为时间线数据点
         points = []
         users_map: Dict[str, str] = {}  # user_id -> username
+        models_set: set = set()  # 收集所有出现的模型
 
         if include_user_info and not user_id:
             for row in rows:
-                created_at, row_user_id, username, interval_minutes = row
-                points.append({
+                created_at, row_user_id, model, username, interval_minutes = row
+                point_data: Dict[str, Any] = {
                     "x": created_at.isoformat(),
                     "y": round(float(interval_minutes), 2),
                     "user_id": str(row_user_id),
-                })
+                }
+                if model:
+                    point_data["model"] = model
+                    models_set.add(model)
+                points.append(point_data)
                 if row_user_id and username:
                     users_map[str(row_user_id)] = username
         else:
             for row in rows:
-                created_at, interval_minutes = row
-                points.append({
+                created_at, model, interval_minutes = row
+                point_data = {
                     "x": created_at.isoformat(),
                     "y": round(float(interval_minutes), 2)
-                })
+                }
+                if model:
+                    point_data["model"] = model
+                    models_set.add(model)
+                points.append(point_data)
 
         response: Dict[str, Any] = {
             "analysis_period_hours": hours,
@@ -1876,4 +1890,8 @@ class UsageService:
         if include_user_info and not user_id:
             response["users"] = users_map
 
+        # 如果有模型信息，返回模型列表
+        if models_set:
+            response["models"] = sorted(models_set)
+
         return response