diff --git a/src/components/ReSegmented/src/index.tsx b/src/components/ReSegmented/src/index.tsx
index f28d30d16e..39580ed8b4 100644
--- a/src/components/ReSegmented/src/index.tsx
+++ b/src/components/ReSegmented/src/index.tsx
@@ -127,7 +127,9 @@ export default defineComponent({
       }
     );
 
-    watch(() => props.size, handleResizeInit);
+    watch(() => props.size, handleResizeInit, {
+      immediate: true
+    });
 
     const rendLabel = () => {
       return props.options.map((option, index) => {