diff --git a/src/api/admin/user.js b/src/api/admin/user.js
index 0fd469a..ffe9d60 100644
--- a/src/api/admin/user.js
+++ b/src/api/admin/user.js
@@ -125,6 +125,13 @@ export const createTask = (data) => {
 export const getUserGroupList = (data) => {
     return http2.get('/api/v1/admin/user_group/list?page=' + data.page + '&count=' + data.count)
 }
+export const setDefaultUserGroup = (data) => {
+    return http2.post('/api/v1/admin/user_group/set_default', data, {
+        headers: {
+            'Content-Type': 'multipart/form-data'
+        }
+    })
+}
 /**获取用户组成员列表 */
 export const getUserGroupMemberList = (data) => {
     return http2.get('/api/v1/admin/user_group/member_list?group_id=' + data.group_id + '&page=' + data.page + '&count=' + data.count)
@@ -174,4 +181,4 @@ export const refundBalance = (data) => {
             'Content-Type': 'multipart/form-data'
         }
     })
-}
\ No newline at end of file
+}
diff --git a/src/views/user/UserGroup.vue b/src/views/user/UserGroup.vue
index 368991d..e209218 100644
--- a/src/views/user/UserGroup.vue
+++ b/src/views/user/UserGroup.vue
@@ -57,7 +57,7 @@
           </el-table-column>
           <el-table-column label="升级金额" width="120">
             <template #default="{ row }">
-              <span v-if="row.floor_price || row.FloorPrice" class="price-text">¥{{ row.floor_price || row.FloorPrice }}</span>
+              <span v-if="getFloorPriceYuan(row) !== null" class="price-text">¥{{ getFloorPriceYuan(row).toFixed(2) }}</span>
               <span v-else>-</span>
             </template>
           </el-table-column>
@@ -66,6 +66,12 @@
               {{ row.higher_level_id || row.HigherLevelId || '-' }}
             </template>
           </el-table-column>
+          <el-table-column label="默认组" width="110" align="center">
+            <template #default="{ row }">
+              <el-tag v-if="isDefaultGroup(row)" type="success" size="small">默认</el-tag>
+              <span v-else class="muted-text">-</span>
+            </template>
+          </el-table-column>
           <el-table-column label="类型" width="100" align="center">
             <template #default="{ row }">
               <el-tag :type="(row.fixed || row.Fixed) ? 'warning' : 'success'" size="small">
@@ -85,9 +91,12 @@
               {{ row.create_time || row.CreateTime || row.CreatedAt || '-' }}
             </template>
           </el-table-column>
-          <el-table-column label="操作" width="340" fixed="right">
+          <el-table-column label="操作" width="420" fixed="right">
             <template #default="{ row }">
               <div class="action-buttons">
+                <el-button v-if="!isDefaultGroup(row)" type="success" link @click="handleSetDefault(row)">
+                  <el-icon><CircleCheck /></el-icon>设为默认
+                </el-button>
                 <el-button type="primary" link @click="handleEdit(row)">
                   <el-icon><Edit /></el-icon>编辑
                 </el-button>
@@ -465,9 +474,10 @@
 <script setup>
 import { ref, reactive, onMounted, nextTick } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
-import { Plus, Refresh, Edit, User, Delete, Connection, Close, Present } from '@element-plus/icons-vue'
+import { Plus, Refresh, Edit, User, Delete, Connection, Close, Present, CircleCheck } from '@element-plus/icons-vue'
 import { 
-  getUserGroupList, 
+  getUserGroupList,
+  setDefaultUserGroup,
   getUserGroupMemberList, 
   createUserGroup, 
   updateUserGroupInfo, 
@@ -546,6 +556,14 @@ const memberFormRef = ref(null)
 const groupSelectorVisible = ref(false)
 const selectedHigherGroupInfo = ref(null)
 
+const getGroupId = (row) => row.group_id ?? row.GroupId ?? row.id ?? row.Id
+const isDefaultGroup = (row) => row.IsDefault === true || row.is_default === true
+const getFloorPriceCent = (row) => row.floor_price ?? row.FloorPrice
+const getFloorPriceYuan = (row) => {
+  const value = getFloorPriceCent(row)
+  return value === undefined || value === null || value === '' ? null : Number(value) / 100
+}
+
 // 获取用户组列表
 const fetchGroupList = async () => {
   loading.value = true
@@ -554,10 +572,6 @@ const fetchGroupList = async () => {
     const code = res.data?.code || res.code
     if (code === 200) {
       let responseData = res.data?.data || res.data
-      responseData.data.forEach(item => {
-        item.CreatedAt = formatTime(item.CreatedAt)
-      })
-      
       if (Array.isArray(responseData)) {
         groupList.value = responseData
         total.value = responseData.length
@@ -571,6 +585,9 @@ const fetchGroupList = async () => {
         groupList.value = []
         total.value = 0
       }
+      groupList.value.forEach(item => {
+        if (item.CreatedAt) item.CreatedAt = formatTime(item.CreatedAt)
+      })
     } else {
       ElMessage.error(res.data?.message || '获取用户组列表失败')
     }
@@ -581,6 +598,30 @@ const fetchGroupList = async () => {
   }
 }
 
+const handleSetDefault = (row) => {
+  const groupId = getGroupId(row)
+  const groupName = row.group_name || row.name || row.Name || `用户组 ${groupId}`
+
+  ElMessageBox.confirm(`确认将“${groupName}”设为默认用户组吗？设置后原默认组将自动取消默认。`, '设置默认用户组', {
+    confirmButtonText: '确认设置',
+    cancelButtonText: '取消',
+    type: 'warning'
+  }).then(async () => {
+    try {
+      const res = await setDefaultUserGroup({ user_group_id: groupId })
+      const code = res.data?.code || res.code
+      if (code === 200) {
+        ElMessage.success('默认用户组设置成功')
+        await fetchGroupList()
+      } else {
+        ElMessage.error(res.data?.message || '设置默认用户组失败')
+      }
+    } catch (error) {
+      ElMessage.error(error.response?.data?.message || '设置默认用户组失败')
+    }
+  }).catch(() => {})
+}
+
 // 获取成员列表
 const fetchMemberList = async () => {
   memberLoading.value = true
@@ -659,7 +700,7 @@ const handleEdit = (row) => {
   const groupName = row.group_name || row.name || row.Name
   const groupAuth = row.auth || row.Auth || ''
   const higherLevelId = row.higher_level_id || row.HigherLevelId
-  const floorPrice = row.floor_price || row.FloorPrice
+  const floorPrice = getFloorPriceYuan(row)
   const fixed = row.fixed || row.Fixed || false
   
   Object.assign(groupForm, {
@@ -743,7 +784,7 @@ const submitForm = () => {
           submitData.higher_level_id = groupForm.higher_level_id
         }
         if (groupForm.floor_price !== undefined && groupForm.floor_price !== null) {
-          submitData.floor_price = groupForm.floor_price
+          submitData.floor_price = Math.round(Number(groupForm.floor_price) * 100)
         }
         submitData.fixed = groupForm.fixed