diff --git a/src/modal/popconfirm.js b/src/modal/popconfirm.js
index 935077c..ca4e677 100644
--- a/src/modal/popconfirm.js
+++ b/src/modal/popconfirm.js
@@ -153,7 +153,7 @@ class PopConfirm extends Component {
       styles.left = left + 'px'
     } else {
       // 减去小三角形的位移 12px
-      let right = window.innerWidth - left + this.clientWidth - 12
+      let right = window.innerWidth - left - this.clientWidth - 12
       if (right < 0) {
         right = 0
       }