diff --git a/src/components/map_tools/map.js b/src/components/map_tools/map.js
index b539991..af41e9b 100644
--- a/src/components/map_tools/map.js
+++ b/src/components/map_tools/map.js
@@ -336,14 +336,18 @@ const addEntity = (id, name, lon, lat, height) => {
 
 export const handleViewAlarm = (alarm, userList) => {
   const canvas = document.createElement("canvas");
-  canvas.width = 100;
-  canvas.height = 30;
+  const width = 100;
+  const height = 30;
+  canvas.width = width;
+  canvas.height = height;
   const ctx = canvas.getContext("2d");
   ctx.fillStyle = "#000000";
   ctx.fillRect(0, 0, 100, 50);
   ctx.fillStyle = "#ff0000";
   ctx.font = "normal bold 20px Arial";
-  ctx.fillText("聚集告警", 5, 15);
+  ctx.textAlign = "center";
+  ctx.textBaseline = "middle";
+  ctx.fillText("聚集告警", width / 2, height / 2);
 
   // 聚集圆锥特效
   const Cone = new window.CustomCesium.Cone(window.$icy);