diff --git a/src/components/radio/radio-group.vue b/src/components/radio/radio-group.vue
index 59d15355..457b43d7 100644
--- a/src/components/radio/radio-group.vue
+++ b/src/components/radio/radio-group.vue
@@ -24,6 +24,9 @@
             size: {
                 validator (value) {
                     return oneOf(value, ['small', 'large', 'default']);
+                },
+                default () {
+                    return this.$IVIEW.size === '' ? 'default' : this.$IVIEW.size;
                 }
             },
             type: {
diff --git a/src/components/radio/radio.vue b/src/components/radio/radio.vue
index f50906b9..8aa48d7c 100644
--- a/src/components/radio/radio.vue
+++ b/src/components/radio/radio.vue
@@ -46,6 +46,9 @@
             size: {
                 validator (value) {
                     return oneOf(value, ['small', 'large', 'default']);
+                },
+                default () {
+                    return this.$IVIEW.size === '' ? 'default' : this.$IVIEW.size;
                 }
             },
             name: {