diff --git a/src/.vuepress/components/Sidevar.vue b/src/.vuepress/components/Sidevar.vue
index 6293387de..c2f25e087 100644
--- a/src/.vuepress/components/Sidevar.vue
+++ b/src/.vuepress/components/Sidevar.vue
@@ -2,19 +2,24 @@
   <Sidebar class="iotdb-sidebar">
     <template #top>
       <p class="vp-sidebar-header iotdb-sidebar-header">
-        <span class="vp-sidebar-title">{{(sidebarItems && sidebarItems.length>0) ? sidebarItems[0]?.text: ''}}</span>
+        <span class="vp-sidebar-title">{{ (sidebarItems && sidebarItems.length > 0) ? sidebarItems[0]?.text : ''
+          }}</span>
       </p>
       <div class="sidebar-top-wrapper">
         <ul class="switch-list" v-if="currentDialect">
-          <li
-            :class="['switch-type', { 'switch-active': currentDialect === 'Tree' }]"
+          <li :class="['switch-type', { 'switch-active': currentDialect === 'Tree' }]"
             @click="handleChangeDialect('Tree')">{{ ModelName.Tree }}
           </li>
-          <li
-            :class="['switch-type', { 'switch-active': currentDialect === 'Table' }]"
+          <li :class="['switch-type', { 'switch-active': currentDialect === 'Table' }]"
             @click="handleChangeDialect('Table')">{{ ModelName.Table }}
           </li>
         </ul>
+        <div class="help-icon-wrapper">
+          <div class="help-icon" @click="handleHelpClick">
+            <span>?</span>
+          </div>
+          <div class="tooltip">{{ ModelName.Tip }}</div>
+        </div>
       </div>
     </template>
   </Sidebar>
@@ -24,10 +29,11 @@
 import { useSidebarItems } from "vuepress-theme-hope/modules/sidebar/composables/index.js";
 import Sidebar from 'vuepress-theme-hope/modules/sidebar/components/Sidebar.js';
 import { ref, watch, computed } from 'vue';
-import { useRoute } from 'vuepress/client';
-import { getDialect, getDocVersion } from '../utils/index.js';
+import { useRoute, withBase, useRouter } from 'vuepress/client';
+import { getDialect, getDocVersion, URL_SUFFIX } from '../utils/index.js';
 
 const route = useRoute();
+const router = useRouter();
 const currentLang = ref('zh');
 const currentVersion = ref('');
 const currentDialect = ref('');
@@ -36,9 +42,11 @@ const ModelName = computed(() => {
   return currentLang.value === 'zh' ? {
     'Tree': '树模型',
     'Table': '表模型',
+    'Tip': '模型选择说明',
   } : {
     'Tree': 'Tree',
     'Table': 'Table',
+    'Tip': 'Model Choice Description',
   };
 });
 
@@ -47,14 +55,17 @@ const sidebarItems = useSidebarItems();
 function handleChangeDialect(val: string) {
   const oldPath = 'latest';
   const newPath = 'latest-Table';
-  if(currentDialect.value ==='Table'){
+  if (currentDialect.value === 'Table') {
     window.location.href = window.location.href.replace(newPath, oldPath);
   } else {
     window.location.href = window.location.href.replace(oldPath, newPath);
   }
-  // window.location.href = `${window.location.origin}/docs${currentLang.value === 'zh' ? currentVersion.value.link : currentVersion.value.enLink}`.replace(currentDialect.value, val);
 }
 
+function handleHelpClick() {
+  const modelLink = withBase((currentLang.value === 'zh' ? 'zh/' : '') + 'UserGuide/' + currentVersion.value + '/Background-knowledge/Data-Model-and-Terminology' + URL_SUFFIX + '.html');
+  router.push(modelLink);
+}
 
 watch(
   () => route.path,
@@ -66,10 +77,89 @@ watch(
       } else {
         currentLang.value = 'en';
       }
-      currentVersion.value = getDocVersion(newVal,'latest');
-      currentDialect.value = getDialect(newVal,'');
+      currentVersion.value = getDocVersion(newVal, 'latest');
+      currentDialect.value = getDialect(newVal, '');
     }
   },
   { immediate: true },
 );
-</script>
\ No newline at end of file
+</script>
+
+<style lang="scss">
+.vp-sidebar .vp-sidebar-links:first-child li:first-child {
+  display: none;
+}
+
+.sidebar-top-wrapper {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  overflow: visible;
+  padding-right: 1.25rem;
+}
+
+.help-icon-wrapper {
+  position: relative;
+  margin-left: 8px;
+  overflow: visible;
+
+  &:hover .tooltip {
+    visibility: visible;
+    opacity: 1;
+  }
+}
+
+.help-icon {
+  width: 24px;
+  height: 24px;
+  border-radius: 50%;
+  background-color: #e0e0e0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  font-size: 1.1rem;
+  font-weight: bold;
+  color: #555;
+  transition: background-color 0.3s;
+
+  &:hover {
+    background-color: #495ad4;
+    color: white;
+  }
+}
+
+.tooltip {
+  position: absolute;
+  top: -30px;
+  left: 50%;
+  transform: translateX(-50%);
+  background-color: #333;
+  color: white;
+  padding: 5px 10px;
+  border-radius: 4px;
+  font-size: 12px;
+  white-space: nowrap;
+  pointer-events: none;
+  z-index: 1000; // 提高 z-index 确保不被遮挡
+  filter: drop-shadow(0 2px 3px rgba(0, 0, 0, 0.3));
+  visibility: hidden;
+  opacity: 0;
+  transition: opacity 0.3s;
+
+  &:after {
+    content: '';
+    position: absolute;
+    bottom: -5px;
+    left: 50%;
+    transform: translateX(-50%);
+    border-width: 5px 5px 0;
+    border-style: solid;
+    border-color: #333 transparent transparent;
+  }
+}
+
+.iotdb-sidebar {
+  overflow: visible !important;
+}
+</style>
\ No newline at end of file
diff --git a/src/.vuepress/utils/getDocVersion.ts b/src/.vuepress/utils/getDocVersion.ts
index ebf261c87..cfd6359bd 100644
--- a/src/.vuepress/utils/getDocVersion.ts
+++ b/src/.vuepress/utils/getDocVersion.ts
@@ -55,3 +55,5 @@ export const getDialect = (path = '', defaultValue = '') => {
   }
   return defaultValue;
 };
+
+export const URL_SUFFIX = '_apache';
\ No newline at end of file