diff --git a/core/core-frontend/src/views/chart/components/editor/editor-senior/components/dialog/LineThresholdEdit.vue b/core/core-frontend/src/views/chart/components/editor/editor-senior/components/dialog/LineThresholdEdit.vue
index d6fbe012a2..1fcbdf37e7 100644
--- a/core/core-frontend/src/views/chart/components/editor/editor-senior/components/dialog/LineThresholdEdit.vue
+++ b/core/core-frontend/src/views/chart/components/editor/editor-senior/components/dialog/LineThresholdEdit.vue
@@ -269,7 +269,11 @@ init()
       >
         <el-row style="margin-top: 6px; align-items: center; justify-content: space-between">
           <el-form-item class="form-item">
-            <el-select v-model="fieldItem.fieldId" @change="addField(fieldItem)">
+            <el-select
+              style="width: 181px"
+              v-model="fieldItem.fieldId"
+              @change="addField(fieldItem)"
+            >
               <el-option
                 class="series-select-option"
                 v-for="fieldOption in state.fields"