diff --git a/src/components/switch/switch.vue b/src/components/switch/switch.vue
index 0780ed9..c279a4f 100644
--- a/src/components/switch/switch.vue
+++ b/src/components/switch/switch.vue
@@ -41,6 +41,9 @@
             size: {
                 validator (value) {
                     return oneOf(value, ['large', 'small', 'default']);
+                },
+                default () {
+                    return this.$IVIEW.size === '' ? 'default' : this.$IVIEW.size;
                 }
             },
             name: {
--
libgit2 0.21.4