diff --git a/controllers/statistics.go b/controllers/statistics.go
index 8e5dc49..1404af5 100644
--- a/controllers/statistics.go
+++ b/controllers/statistics.go
@@ -5,6 +5,7 @@ import (
 	"hr_receiver/config"
 	"hr_receiver/models"
 	"net/http"
+	"sort"
 	"strconv"
 	"strings"
 	"time"
@@ -334,3 +335,125 @@ func (sc *StatisticsController) StatisticsByRegion(c *gin.Context) {
 		"regions": regions,
 	})
 }
+
+func (sc *StatisticsController) TimelineStatistics(c *gin.Context) {
+	regionIDStr := c.Query("regionId")
+	startTimeStr := c.Query("startTime")
+	endTimeStr := c.Query("endTime")
+
+	query := sc.DB.Model(&models.AIAnalysisRecord{})
+	if regionIDStr != "" {
+		if regionID, err := strconv.ParseUint(regionIDStr, 10, 32); err == nil {
+			query = query.Where("region_id = ?", uint32(regionID))
+		}
+	}
+	if startTimeStr != "" {
+		if startTime, err := strconv.ParseInt(startTimeStr, 10, 64); err == nil {
+			query = query.Where("upload_time >= ?", startTime)
+		}
+	}
+	if endTimeStr != "" {
+		if endTime, err := strconv.ParseInt(endTimeStr, 10, 64); err == nil {
+			query = query.Where("upload_time <= ?", endTime)
+		}
+	}
+
+	type timelineItem struct {
+		Date         string `json:"date"`
+		Count        int64  `json:"count"`
+		InputTokens  int64  `json:"inputTokens"`
+		OutputTokens int64  `json:"outputTokens"`
+	}
+
+	type rawRegionTimeline struct {
+		RegionID     *uint32
+		Date         string
+		Count        int64
+		InputTokens  int64
+		OutputTokens int64
+	}
+
+	var rawResults []rawRegionTimeline
+	err := query.Select(`
+		region_id,
+		DATE(TO_TIMESTAMP(upload_time / 1000.0)) as date,
+		COUNT(*) as count,
+		COALESCE(SUM(input_tokens), 0) as input_tokens,
+		COALESCE(SUM(output_tokens), 0) as output_tokens
+	`).Group("region_id, DATE(TO_TIMESTAMP(upload_time / 1000.0))").Order("region_id, date ASC").Scan(&rawResults).Error
+
+	if err != nil {
+		writeError(c, http.StatusInternalServerError, "failed to query timeline statistics")
+		return
+	}
+
+	overallMap := make(map[string]*timelineItem)
+	regionItemsMap := make(map[string][]timelineItem)
+	regionIDs := make([]uint32, 0)
+	regionIDSet := make(map[uint32]struct{})
+
+	for _, r := range rawResults {
+		if overallMap[r.Date] == nil {
+			overallMap[r.Date] = &timelineItem{Date: r.Date}
+		}
+		overallMap[r.Date].Count += r.Count
+		overallMap[r.Date].InputTokens += r.InputTokens
+		overallMap[r.Date].OutputTokens += r.OutputTokens
+
+		regionID := uint32(0)
+		if r.RegionID != nil {
+			regionID = *r.RegionID
+		}
+		regionIDStr := strconv.FormatUint(uint64(regionID), 10)
+		regionItemsMap[regionIDStr] = append(regionItemsMap[regionIDStr], timelineItem{
+			Date:         r.Date,
+			Count:        r.Count,
+			InputTokens:  r.InputTokens,
+			OutputTokens: r.OutputTokens,
+		})
+		if _, ok := regionIDSet[regionID]; !ok && regionID > 0 {
+			regionIDSet[regionID] = struct{}{}
+			regionIDs = append(regionIDs, regionID)
+		}
+	}
+
+	// 查询幼儿园名称
+	kindergartenMap := make(map[uint32]string)
+	if len(regionIDs) > 0 {
+		var kindergartens []models.Kindergarten
+		if err := sc.DB.Where("region_id IN ?", regionIDs).Find(&kindergartens).Error; err == nil {
+			for _, k := range kindergartens {
+				kindergartenMap[k.RegionID] = k.Name
+			}
+		}
+	}
+
+	type regionTimeline struct {
+		Name  string         `json:"name"`
+		Items []timelineItem `json:"items"`
+	}
+	regionsMap := make(map[string]regionTimeline)
+	for regionIDStr, items := range regionItemsMap {
+		name := ""
+		if regionID, err := strconv.ParseUint(regionIDStr, 10, 32); err == nil && regionID > 0 {
+			name = kindergartenMap[uint32(regionID)]
+		}
+		regionsMap[regionIDStr] = regionTimeline{
+			Name:  name,
+			Items: items,
+		}
+	}
+
+	var overall []timelineItem
+	for _, item := range overallMap {
+		overall = append(overall, *item)
+	}
+	sort.Slice(overall, func(i, j int) bool {
+		return overall[i].Date < overall[j].Date
+	})
+
+	writeSuccess(c, http.StatusOK, "query success", gin.H{
+		"overall": overall,
+		"regions": regionsMap,
+	})
+}
diff --git a/routes/routes.go b/routes/routes.go
index 0d4842d..dd3ecbf 100644
--- a/routes/routes.go
+++ b/routes/routes.go
@@ -90,6 +90,7 @@ func SetupRouter() *gin.Engine {
 			admin.GET("/statistics/ai-analysis-records", statisticsController.ListAIAnalysisRecords)
 			admin.DELETE("/statistics/ai-analysis-records/:id", statisticsController.DeleteAIAnalysisRecord)
 			admin.GET("/statistics/ai-analysis", statisticsController.StatisticsByRegion)
+			admin.GET("/statistics/ai-analysis-timeline", statisticsController.TimelineStatistics)
 		}
 
 		v1.GET("/admin/system-debug/mqtt/ws", systemDebugController.MqttWebSocket)