diff --git a/web/app/components/workflow/block-selector/constants.ts b/web/app/components/workflow/block-selector/constants.ts
new file mode 100644
index 0000000000..85b2ac69b8
--- /dev/null
+++ b/web/app/components/workflow/block-selector/constants.ts
@@ -0,0 +1,80 @@
+export const TABS = [
+  {
+    key: 'blocks',
+    name: 'Blocks',
+  },
+  {
+    key: 'built-in-tool',
+    name: 'Built-in Tool',
+  },
+  {
+    key: 'custom-tool',
+    name: 'Custom Tool',
+  },
+]
+
+export const BLOCKS = [
+  {
+    type: 'start',
+    title: 'Start',
+    description: '',
+    icon: '',
+  },
+  {
+    type: 'llm',
+    title: 'LLM',
+    icon: '',
+  },
+  {
+    type: 'end',
+    title: 'End',
+    icon: '',
+  },
+  {
+    type: 'direct-answer',
+    title: 'Direct Answer',
+    icon: '',
+  },
+  {
+    classification: 'Question Understand',
+    type: 'knowledge-retrieval',
+    title: 'Knowledge Retrieval',
+    icon: '',
+  },
+  {
+    classification: 'Question Understand',
+    type: 'question-classifier',
+    title: 'Question Classifier',
+    icon: '',
+  },
+  {
+    classification: 'Logic',
+    type: 'if-else',
+    title: 'IF/ELSE',
+    icon: '',
+  },
+  {
+    classification: 'Transform',
+    type: 'code',
+    title: 'Code',
+    icon: '',
+  },
+  {
+    classification: 'Transform',
+    type: 'template-transform',
+    title: 'Templating Transform',
+    icon: '',
+  },
+  {
+    classification: 'Transform',
+    type: 'variable-assigner',
+    title: 'Variable Assigner',
+    icon: '',
+  },
+  {
+    classification: 'Utilities',
+    type: 'http-request',
+    title: 'HTTP Request',
+    icon: '',
+  },
+]
diff --git a/web/app/components/workflow/block-selector/index.tsx b/web/app/components/workflow/block-selector/index.tsx
new file mode 100644
index 0000000000..b946d0f91f
--- /dev/null
+++ b/web/app/components/workflow/block-selector/index.tsx
@@ -0,0 +1,54 @@
+import type { FC, ReactElement } from 'react'
+import {
+  memo,
+  useCallback,
+  useState,
+} from 'react'
+import Tabs from './tabs'
+import {
+  PortalToFollowElem,
+  PortalToFollowElemContent,
+  PortalToFollowElemTrigger,
+} from '@/app/components/base/portal-to-follow-elem'
+import { SearchLg } from '@/app/components/base/icons/src/vender/line/general'
+
+type NodeSelectorProps = {
+  children: ReactElement
+}
+const NodeSelector: FC<NodeSelectorProps> = ({
+  children,
+}) => {
+  const [open, setOpen] = useState(false)
+  const handleTrigger: any = useCallback((e: MouseEvent) => {
+    e.stopPropagation()
+    setOpen(v => !v)
+  }, [])
+
+  return (
+    <PortalToFollowElem
+      open={open}
+      onOpenChange={setOpen}
+      placement='right-start'
+    >
+      <PortalToFollowElemTrigger onClick={handleTrigger}>
+        {children}
+      </PortalToFollowElemTrigger>
+      <PortalToFollowElemContent>
+        <div className='w-[256px] rounded-lg border-[0.5px] border-gray-200 bg-white shadow-lg'>
+          <div className='px-2 pt-2'>
+            <div className='flex items-center px-2 rounded-lg bg-gray-100'>
+              <SearchLg className='shrink-0 ml-[1px] mr-[5px] w-3.5 h-3.5 text-gray-400' />
+              <input
+                className='grow px-0.5 py-[7px] text-[13px] bg-transparent appearance-none outline-none'
+                placeholder='Search block'
+              />
+            </div>
+          </div>
+          <Tabs />
+        </div>
+      </PortalToFollowElemContent>
+    </PortalToFollowElem>
+  )
+}
+
+export default memo(NodeSelector)
diff --git a/web/app/components/workflow/block-selector/tabs.tsx b/web/app/components/workflow/block-selector/tabs.tsx
new file mode 100644
index 0000000000..42919813af
--- /dev/null
+++ b/web/app/components/workflow/block-selector/tabs.tsx
@@ -0,0 +1,45 @@
+import { useState } from 'react'
+import {
+  BLOCKS,
+  TABS,
+} from './constants'
+
+const Tabs = () => {
+  const [activeTab, setActiveTab] = useState(TABS[0].key)
+
+  return (
+    <div>
+      <div className='flex items-center justify-between px-3 h-[34px] border-b-[0.5px] border-b-black/5'>
+        {
+          TABS.map(tab => (
+            <div
+              key={tab.key}
+              className={`
+                text-[13px] font-medium cursor-pointer
+                ${activeTab === tab.key ? 'text-gray-700' : 'text-gray-500'}
+              `}
+              onClick={() => setActiveTab(tab.key)}
+            >
+              {tab.name}
+            </div>
+          ))
+        }
+      </div>
+      <div className='p-1'>
+        {
+          BLOCKS.map(block => (
+            <div
+              key={block.type}
+              className='flex items-center h-8 rounded-lg hover:bg-gray-50 cursor-pointer'
+            >
+              <div className='mr-2 w-5 h-5' />
+              <div className='text-sm text-gray-900'>{block.title}</div>
+            </div>
+          ))
+        }
+      </div>
+    </div>
+  )
+}
+
+export default Tabs
diff --git a/web/app/components/workflow/nodes/_base/node.tsx b/web/app/components/workflow/nodes/_base/node.tsx
index a348fd29c3..7ab926b205 100644
--- a/web/app/components/workflow/nodes/_base/node.tsx
+++ b/web/app/components/workflow/nodes/_base/node.tsx
@@ -8,6 +8,7 @@ import {
   useNodeId,
 } from 'reactflow'
 import { useWorkflowContext } from '../../context'
+import BlockSelector from '../../block-selector'
 import { Plus } from '@/app/components/base/icons/src/vender/line/general'
 
 type BaseNodeProps = {
@@ -48,15 +49,17 @@ const BaseNode: FC<BaseNodeProps> = ({
       <div className='px-3 pt-1 pb-1 text-xs text-gray-500'>
         Define the initial parameters for launching a workflow
       </div>
-      <div
-        className={`
-          hidden absolute -bottom-2 left-1/2 -translate-x-1/2 items-center justify-center 
-          w-4 h-4 rounded-full bg-primary-600 cursor-pointer z-10
-          ${!outgoers.length && 'group-hover:flex'}
-        `}
-      >
-        <Plus className='w-2.5 h-2.5 text-white' />
-      </div>
+      <BlockSelector>
+        <div
+          className={`
+            hidden absolute -bottom-2 left-1/2 -translate-x-1/2 items-center justify-center 
+            w-4 h-4 rounded-full bg-primary-600 cursor-pointer z-10
+            ${!outgoers.length && 'group-hover:flex'}
+          `}
+        >
+          <Plus className='w-2.5 h-2.5 text-white' />
+        </div>
+      </BlockSelector>
     </div>
   )
 }