diff --git a/library/src/main/ets/components/imageknife/RequestOption.ets b/library/src/main/ets/components/imageknife/RequestOption.ets
index 3d2c610..63deff9 100644
--- a/library/src/main/ets/components/imageknife/RequestOption.ets
+++ b/library/src/main/ets/components/imageknife/RequestOption.ets
@@ -93,7 +93,11 @@ export class RequestOption {
 
   // 全局调用header对应的方法，包含RequestOption的形式
   addHeaderMap(map: Map<string, Object>) {
-    this.headers = map;
+    map.forEach((value, key) => {
+      if (!this.headers.has(key)) {
+        this.addHeader(key, value);
+      }
+    })
   }
 
   // 优先级