diff --git a/pages/alerttopo/elements/config/edge-config-common.vue b/pages/alerttopo/elements/config/edge-config-common.vue
index e80fe7c02337881bf3c2c37094a9523dd8f087d0..d809af9c5cd23f8d98fec6c8b1961aba83a853bc 100644
--- a/pages/alerttopo/elements/config/edge-config-common.vue
+++ b/pages/alerttopo/elements/config/edge-config-common.vue
@@ -46,6 +46,7 @@
               edge.setAttrByPath('line/targetMarker/fill', val);
               edge.setAttrByPath('line/sourceMarker/fill', val);
               edge.setAttrByPath('label/style', 'fill:' + val);
+              edge.setAttrByPath('line/data-default-class', null); // 修改值时，移除默认样式
             } else {
               edge.setAttrByPath('line/class', 'line');
               edge.setAttrByPath('line/targetMarker/class', 'marker');