diff --git a/packages/theme-chalk/src/common/var.scss b/packages/theme-chalk/src/common/var.scss
index e4f1ddc081..a43c19309a 100644
--- a/packages/theme-chalk/src/common/var.scss
+++ b/packages/theme-chalk/src/common/var.scss
@@ -661,6 +661,7 @@ $dialog: map.merge(
     'content-font-size': 14px,
     'font-line-height': var(--el-font-line-height-primary),
     'padding-primary': 20px,
+    'border-radius': var(--el-border-radius-small),
   ),
   $dialog
 );
diff --git a/packages/theme-chalk/src/dialog.scss b/packages/theme-chalk/src/dialog.scss
index 39b5d577f1..8346c60288 100644
--- a/packages/theme-chalk/src/dialog.scss
+++ b/packages/theme-chalk/src/dialog.scss
@@ -12,7 +12,7 @@
   position: relative;
   margin: var(--el-dialog-margin-top, 15vh) auto 50px;
   background: var(--el-dialog-bg-color);
-  border-radius: var(--el-border-radius-small);
+  border-radius: var(--el-dialog-border-radius);
   box-shadow: var(--el-dialog-box-shadow);
   box-sizing: border-box;
   width: var(--el-dialog-width, 50%);