diff --git a/web/src/views/Workflow/components/Properties/VariableSelect.tsx b/web/src/views/Workflow/components/Properties/VariableSelect.tsx
index f56180a0..7ae4eff5 100644
--- a/web/src/views/Workflow/components/Properties/VariableSelect.tsx
+++ b/web/src/views/Workflow/components/Properties/VariableSelect.tsx
@@ -1,18 +1,36 @@
+/*
+ * @Author: ZhaoYing 
+ * @Date: 2026-02-03 15:40:13 
+ * @Last Modified by:   ZhaoYing 
+ * @Last Modified time: 2026-02-03 15:40:13 
+ */
 import { type FC } from 'react'
 import clsx from 'clsx';
 import { Select, type SelectProps } from 'antd'
 import type { Suggestion } from '../Editor/plugin/AutocompletePlugin'
 type LabelRender = SelectProps['labelRender'];
 
+/**
+ * Props for VariableSelect component
+ */
 interface VariableSelectProps extends SelectProps {
+  /** Available variable options */
   options: Suggestion[];
+  /** Current selected value */
   value?: string;
-  onChange?: (value: string) => void;
+  /** Whether to show clear button */
   allowClear?: boolean;
+  /** Filter out boolean type variables */
   filterBooleanType?: boolean;
+  /** Size of the select component */
   size?: 'small' | 'middle' | 'large'
 }
 
+/**
+ * VariableSelect component
+ * Custom select component for workflow variables with grouped options and custom rendering
+ * @param props - Component props
+ */
 const VariableSelect: FC<VariableSelectProps> = ({
   placeholder,
   options,
@@ -24,9 +42,19 @@ const VariableSelect: FC<VariableSelectProps> = ({
   ...resetPorps
 }) => {
 
-  const handleChange = (value: string) => {
-    onChange?.(value);
+  /**
+   * Handle value change and pass selected option to parent
+   * @param value - Selected value
+   */
+  const handleChange: SelectProps['onChange'] = (value: string) => {
+    const filterItem = options.find(option => `{{${option.value}}}` === value)
+    onChange?.(value, filterItem);
   }
+  /**
+   * Custom label renderer for selected value
+   * Displays node icon, name and variable label
+   * @param props - Label render props
+   */
   const labelRender: LabelRender = (props) => {
     const { value } = props
     const filterOption = filteredOptions.find(vo => `{{${vo.value}}}` === value)
@@ -57,10 +85,14 @@ const VariableSelect: FC<VariableSelectProps> = ({
     }
     return null
   }
+  // Filter options based on boolean type if needed
   const filteredOptions = filterBooleanType 
     ? options.filter(option => option.dataType !== 'boolean')
     : options;
 
+  /**
+   * Group suggestions by node ID
+   */
   const groupedSuggestions = filteredOptions.reduce((groups: Record<string, any[]>, suggestion) => {
     const { nodeData } = suggestion
     const nodeId = nodeData.id as string;
@@ -71,6 +103,9 @@ const VariableSelect: FC<VariableSelectProps> = ({
     return groups;
   }, {});
 
+  /**
+   * Format grouped options for Select component
+   */
   const groupedOptions = Object.entries(groupedSuggestions).map(([_nodeId, suggestions]) => ({
     label: suggestions[0].nodeData.name,
     options: suggestions.map(s => ({ 
diff --git a/web/src/views/Workflow/components/Properties/index.tsx b/web/src/views/Workflow/components/Properties/index.tsx
index aa757275..59860005 100644
--- a/web/src/views/Workflow/components/Properties/index.tsx
+++ b/web/src/views/Workflow/components/Properties/index.tsx
@@ -1,3 +1,9 @@
+/*
+ * @Author: ZhaoYing 
+ * @Date: 2026-02-03 15:39:59 
+ * @Last Modified by:   ZhaoYing 
+ * @Last Modified time: 2026-02-03 15:39:59 
+ */
 import { type FC, useEffect, useState, useMemo } from "react";
 import clsx from 'clsx'
 import { useTranslation } from 'react-i18next'
@@ -31,17 +37,35 @@ import RbSlider from './RbSlider'
 import JinjaRender from './JinjaRender'
 import CodeExecution from './CodeExecution'
 
+/**
+ * Props for Properties component
+ */
 interface PropertiesProps {
+  /** Currently selected node */
   selectedNode?: Node | null; 
+  /** Function to update selected node */
   setSelectedNode: (node: Node | null) => void;
+  /** Reference to graph instance */
   graphRef: React.MutableRefObject<Graph | undefined>;
+  /** Handler for blank canvas click */
   blankClick: () => void;
+  /** Handler for delete event */
   deleteEvent: () => void;
+  /** Handler for copy event */
   copyEvent: () => void;
+  /** Handler for paste event */
   parseEvent: () => void;
+  /** Workflow configuration */
   config?: any;
+  /** Chat variables */
   chatVariables: ChatVariable[];
 }
+
+/**
+ * Properties panel component
+ * Displays and manages configuration for selected workflow node
+ * @param props - Component props
+ */
 const Properties: FC<PropertiesProps> = ({
   selectedNode,
   graphRef,
@@ -83,6 +107,10 @@ const Properties: FC<PropertiesProps> = ({
     }
   }, [selectedNode, form])
 
+  /**
+   * Update node label in graph
+   * @param newLabel - New label text
+   */
   const updateNodeLabel = (newLabel: string) => {
     if (selectedNode && form) {
       const nodeData = selectedNode.data as NodeProperties;
@@ -107,8 +135,6 @@ const Properties: FC<PropertiesProps> = ({
         }))
       }
 
-
-
       Object.keys(values).forEach(key => {
         if (selectedNode.data?.config?.[key]) {
           // Create a deep copy to avoid reference sharing between nodes
@@ -131,7 +157,12 @@ const Properties: FC<PropertiesProps> = ({
 
 
 
-  // Filter out boolean type variables for loop and llm nodes
+  /**
+   * Get filtered variable list based on node type and config key
+   * @param nodeType - Type of the node
+   * @param key - Configuration key
+   * @returns Filtered variable list
+   */
   const getFilteredVariableList = (nodeType?: string, key?: string) => {
     // Check if current node is a child of iteration node
     const parentIterationNode = selectedNode ? (() => {
@@ -321,15 +352,33 @@ const Properties: FC<PropertiesProps> = ({
 
   console.log('values', values)
 
+  /**
+   * Get current node output variables
+   */
   const currentNodeVariables = useMemo(() => {
     if (!selectedNode) return []
     return getCurrentNodeVariables(selectedNode?.getData(), values)
   }, [selectedNode?.getData(), values])
 
   const [outputCollapsed, setOutputCollapsed] = useState(true)
+  /**
+   * Toggle output section collapsed state
+   */
   const handleToggle = () => {
     setOutputCollapsed((prev: boolean) => !prev)
   }
+
+  /**
+   * Handle variable list change and update output type for iteration nodes
+   * @param _value - Selected value
+   * @param option - Selected option
+   * @param key - Configuration key
+   */
+  const handleChangeVariableList = (_value: string, option: any, key: string) => {
+    if (selectedNode?.data?.type === 'iteration' && key === 'output') {
+      form.setFieldValue('output_type', option?.dataType)
+    }
+  }
   console.log('variableList', variableList, currentNodeVariables)
 
   return (
@@ -422,6 +471,9 @@ const Properties: FC<PropertiesProps> = ({
                   </Form.Item>
                 )
               }
+              if (selectedNode?.data?.type === 'iteration' && key === 'output_type') {
+                return (<Form.Item key={key} name={key} hidden />)
+              }
               if (config.type === 'define') {
                 return null
               }
@@ -628,8 +680,8 @@ const Properties: FC<PropertiesProps> = ({
                           );
                         }
                         return baseVariableList;
-                      })()
-                      }
+                      })()}
+                      onChange={(value, option) => handleChangeVariableList(value, option, key)}
                       size="small"
                     />
                     : config.type === 'switch'
diff --git a/web/src/views/Workflow/constant.ts b/web/src/views/Workflow/constant.ts
index aa49445a..695f6a73 100644
--- a/web/src/views/Workflow/constant.ts
+++ b/web/src/views/Workflow/constant.ts
@@ -2,7 +2,7 @@
  * @Author: ZhaoYing 
  * @Date: 2026-02-03 15:06:18 
  * @Last Modified by: ZhaoYing
- * @Last Modified time: 2026-02-03 15:10:19
+ * @Last Modified time: 2026-02-03 15:25:25
  */
 import LoopNode from './components/Nodes/LoopNode';
 import NormalNode from './components/Nodes/NormalNode';
@@ -317,6 +317,9 @@ export const nodeLibrary: NodeLibrary[] = [
           output: {
             type: 'variableList',
             filterChildNodes: true
+          },
+          output_type: {
+            type: 'define',
           }
         },
       },