diff --git a/src/views/exa/HistoryLine.vue b/src/views/exa/HistoryLine.vue
index 82cb8e0..2a15960 100644
--- a/src/views/exa/HistoryLine.vue
+++ b/src/views/exa/HistoryLine.vue
@@ -108,6 +108,7 @@ watch(
 
       },
       title: title.value,
+
       toolbox: {
         feature: {
           dataZoom: {
@@ -174,6 +175,10 @@ watch(
           type: 'slider',
           start: 0,
           end: 100,
+          // ✅ 显示趋势的关键
+          showDataShadow: true,
+          // 缩放条高度
+          height: 30,
         },
         // 没有下面这块的话，只能拖动滚动条，
         // 鼠标滚轮在区域内不能控制外部滚动条