diff --git a/models/send_tasks_logs.go b/models/send_tasks_logs.go
index 012030b..43ed36a 100644
--- a/models/send_tasks_logs.go
+++ b/models/send_tasks_logs.go
@@ -318,13 +318,16 @@ func GetBasicStatisticData() (BasicStatisticData, error) {
 }
 
 // GetTrendStatisticData 获取趋势统计数据（使用 send_stats 表）
-func GetTrendStatisticData() (TrendStatisticData, error) {
+func GetTrendStatisticData(days int) (TrendStatisticData, error) {
 	var statistic TrendStatisticData
 	var latestData []LatestSendData
 	statsTable := GetSchema(SendStats{})
 
-	// 最近30天数据
-	days := 30
+	// 默认30天，如果传入参数则使用参数值
+	if days <= 0 {
+		days = 30
+	}
+	
 	now := util.GetNowTime()
 	past := now.AddDate(0, 0, -days)
 	pastDate := past.Format("2006-01-02")
diff --git a/routers/api/v1/statistic.go b/routers/api/v1/statistic.go
index 4fd1461..6b5ab4a 100644
--- a/routers/api/v1/statistic.go
+++ b/routers/api/v1/statistic.go
@@ -6,6 +6,7 @@ import (
 	"message-nest/pkg/app"
 	"message-nest/service/statistic_service"
 	"net/http"
+	"strconv"
 )
 
 // GetStatisticData 获取发送统计数据
@@ -28,6 +29,15 @@ func GetStatisticData(c *gin.Context) {
 		}
 		appG.CResponse(http.StatusOK, "获取基础统计成功", data)
 	case "trend":
+		// 获取 days 参数，默认30天
+		days := 30
+		if daysParam := c.Query("days"); daysParam != "" {
+			if d, err := strconv.Atoi(daysParam); err == nil && d > 0 {
+				days = d
+			}
+		}
+		
+		msgService.Days = days
 		data, err := msgService.GetTrendStatisticData()
 		if err != nil {
 			appG.CResponse(http.StatusInternalServerError, fmt.Sprintf("获取趋势统计失败！原因：%s", err), nil)
diff --git a/service/statistic_service/statistic.go b/service/statistic_service/statistic.go
index 59ef2f8..5f4ef4f 100644
--- a/service/statistic_service/statistic.go
+++ b/service/statistic_service/statistic.go
@@ -20,7 +20,11 @@ func (sw *StatisticService) GetBasicStatisticData() (models.BasicStatisticData,
 
 // GetTrendStatisticData 获取趋势统计数据
 func (sw *StatisticService) GetTrendStatisticData() (models.TrendStatisticData, error) {
-	return models.GetTrendStatisticData()
+	days := sw.Days
+	if days <= 0 {
+		days = 30 // 默认30天
+	}
+	return models.GetTrendStatisticData(days)
 }
 
 // GetChannelStatisticData 获取渠道统计数据
diff --git a/web/src/components/pages/dashboard/Dashboard.vue b/web/src/components/pages/dashboard/Dashboard.vue
index 4eea437..c2ef7e8 100644
--- a/web/src/components/pages/dashboard/Dashboard.vue
+++ b/web/src/components/pages/dashboard/Dashboard.vue
@@ -63,7 +63,11 @@ const getBasicStatisticData = async () => {
 const getTrendStatisticData = async () => {
   state.loading.trend = true;
   try {
-    const rsp = await request.get('/statistic?type=trend');
+    // 根据屏幕大小决定请求的天数
+    const isSmallScreen = window.innerWidth < 768;
+    const days = isSmallScreen ? 15 : 30;
+    
+    const rsp = await request.get(`/statistic?type=trend&days=${days}`);
     if (rsp && rsp.data && rsp.data.code == 200) {
       state.trendData = rsp.data.data;
       // 数据加载完成后重新渲染折线图
@@ -112,6 +116,7 @@ const loadAllStatisticData = async () => {
 
 const renderLineChart = () => {
   const latestSendData = state.trendData.latest_send_data || [];
+  
   const options = {
     series: [
       {
@@ -321,8 +326,10 @@ const renderLineChart = () => {
           height: 300
         },
         legend: {
-          position: 'bottom',
-          offsetY: 0
+          position: 'top',
+          horizontalAlign: 'center',
+          offsetY: 0,
+          offsetX: 0
         }
       }
     }]