diff --git a/src/views/modules/sys/user-add-or-update.vue b/src/views/modules/sys/user-add-or-update.vue
index 35a2195..1c2e4cd 100644
--- a/src/views/modules/sys/user-add-or-update.vue
+++ b/src/views/modules/sys/user-add-or-update.vue
@@ -356,7 +356,11 @@
       })
       this.selectedSiteIds.forEach(siteId => {
         if (!this.subSiteCheckedMap[siteId]) {
-          this.$set(this.subSiteCheckedMap, siteId, [])
+          // 新勾选父site时，默认勾选该site下全部子site
+          const defaultCheckedSubSites = this.getSubSiteOptions(siteId)
+            .map(subSite => subSite.subSiteId)
+            .filter(Boolean)
+          this.$set(this.subSiteCheckedMap, siteId, defaultCheckedSubSites)
         }
       })
       this.buildSiteAccessData()