diff --git a/web/app/components/workflow/nodes/knowledge-base/components/chunk-structure/index.tsx b/web/app/components/workflow/nodes/knowledge-base/components/chunk-structure/index.tsx
index 92d1e3e748..92e72c7753 100644
--- a/web/app/components/workflow/nodes/knowledge-base/components/chunk-structure/index.tsx
+++ b/web/app/components/workflow/nodes/knowledge-base/components/chunk-structure/index.tsx
@@ -1,13 +1,15 @@
 import { memo } from 'react'
 import { useTranslation } from 'react-i18next'
+import { RiAddLine } from '@remixicon/react'
 import { Field } from '@/app/components/workflow/nodes/_base/components/layout'
 import type { ChunkStructureEnum } from '../../types'
 import OptionCard from '../option-card'
 import Selector from './selector'
 import { useChunkStructure } from './hooks'
+import Button from '@/app/components/base/button'
 
 type ChunkStructureProps = {
-  chunkStructure: ChunkStructureEnum
+  chunkStructure?: ChunkStructureEnum
   onChunkStructureChange: (value: ChunkStructureEnum) => void
   readonly?: boolean
 }
@@ -27,7 +29,7 @@ const ChunkStructure = ({
       fieldTitleProps={{
         title: t('workflow.nodes.knowledgeBase.chunkStructure'),
         tooltip: t('workflow.nodes.knowledgeBase.chunkStructure'),
-        operation: (
+        operation: chunkStructure && (
           <Selector
             options={options}
             value={chunkStructure}
@@ -37,12 +39,34 @@ const ChunkStructure = ({
         ),
       }}
     >
-      <OptionCard
-        {...optionMap[chunkStructure]}
-        selectedId={chunkStructure}
-        enableSelect={false}
-        enableHighlightBorder={false}
-      />
+      {
+        chunkStructure && (
+          <OptionCard
+            {...optionMap[chunkStructure]}
+            selectedId={chunkStructure}
+            enableSelect={false}
+            enableHighlightBorder={false}
+          />
+        )
+      }
+      {
+        !chunkStructure && (
+          <Selector
+            options={options}
+            onChange={onChunkStructureChange}
+            readonly={readonly}
+            trigger={(
+              <Button
+                className='w-full'
+                variant='secondary-accent'
+              >
+                <RiAddLine className='mr-1 h-4 w-4' />
+                {t('workflow.nodes.knowledgeBase.chooseChunkStructure')}
+              </Button>
+            )}
+          />
+        )
+      }
     </Field>
   )
 }
diff --git a/web/app/components/workflow/nodes/knowledge-base/components/chunk-structure/selector.tsx b/web/app/components/workflow/nodes/knowledge-base/components/chunk-structure/selector.tsx
index 47afa914ce..97a5740fce 100644
--- a/web/app/components/workflow/nodes/knowledge-base/components/chunk-structure/selector.tsx
+++ b/web/app/components/workflow/nodes/knowledge-base/components/chunk-structure/selector.tsx
@@ -1,3 +1,4 @@
+import type { ReactNode } from 'react'
 import { useCallback, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import {
@@ -12,15 +13,17 @@ import type { Option } from './type'
 
 type SelectorProps = {
   options: Option[]
-  value: ChunkStructureEnum
+  value?: ChunkStructureEnum
   onChange: (key: ChunkStructureEnum) => void
   readonly?: boolean
+  trigger?: ReactNode
 }
 const Selector = ({
   options,
   value,
   onChange,
   readonly,
+  trigger,
 }: SelectorProps) => {
   const { t } = useTranslation()
   const [open, setOpen] = useState(false)
@@ -40,17 +43,24 @@ const Selector = ({
       open={open}
       onOpenChange={setOpen}
     >
-      <PortalToFollowElemTrigger onClick={() => {
-        if (readonly)
-          return
-        setOpen(!open)
-      }}>
-        <Button
-          size='small'
-          variant='ghost-accent'
-        >
-          {t('workflow.panel.change')}
-        </Button>
+      <PortalToFollowElemTrigger
+        asChild
+        onClick={() => {
+          if (readonly)
+            return
+          setOpen(!open)
+        }}
+      >
+        {
+          trigger || (
+            <Button
+              size='small'
+              variant='ghost-accent'
+            >
+              {t('workflow.panel.change')}
+            </Button>
+          )
+        }
       </PortalToFollowElemTrigger>
       <PortalToFollowElemContent className='z-10'>
         <div className='w-[404px] rounded-2xl border-[0.5px] border-components-panel-border bg-components-panel-bg-blur shadow-xl backdrop-blur-[5px]'>
diff --git a/web/app/components/workflow/nodes/knowledge-base/components/index-method.tsx b/web/app/components/workflow/nodes/knowledge-base/components/index-method.tsx
index 05ac638403..0888668873 100644
--- a/web/app/components/workflow/nodes/knowledge-base/components/index-method.tsx
+++ b/web/app/components/workflow/nodes/knowledge-base/components/index-method.tsx
@@ -21,7 +21,7 @@ import {
 
 type IndexMethodProps = {
   chunkStructure: ChunkStructureEnum
-  indexMethod: IndexMethodEnum
+  indexMethod?: IndexMethodEnum
   onIndexMethodChange: (value: IndexMethodEnum) => void
   keywordNumber: number
   onKeywordNumberChange: (value: number) => void
diff --git a/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/hooks.tsx b/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/hooks.tsx
index 34d1269d8c..9d39f81182 100644
--- a/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/hooks.tsx
+++ b/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/hooks.tsx
@@ -15,7 +15,7 @@ import type {
   Option,
 } from './type'
 
-export const useRetrievalSetting = (indexMethod: IndexMethodEnum) => {
+export const useRetrievalSetting = (indexMethod?: IndexMethodEnum) => {
   const { t } = useTranslation()
   const VectorSearchOption: Option = useMemo(() => {
     return {
diff --git a/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/index.tsx b/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/index.tsx
index af038e91fc..2fe1ddb96b 100644
--- a/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/index.tsx
+++ b/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/index.tsx
@@ -17,11 +17,11 @@ import type { RerankingModelSelectorProps } from './reranking-model-selector'
 import SearchMethodOption from './search-method-option'
 
 type RetrievalSettingProps = {
-  indexMethod: IndexMethodEnum
+  indexMethod?: IndexMethodEnum
   readonly?: boolean
-  searchMethod: RetrievalSearchMethodEnum
+  searchMethod?: RetrievalSearchMethodEnum
   onRetrievalSearchMethodChange: (value: RetrievalSearchMethodEnum) => void
-  hybridSearchMode: HybridSearchModeEnum
+  hybridSearchMode?: HybridSearchModeEnum
   onHybridSearchModeChange: (value: HybridSearchModeEnum) => void
   rerankingModelEnabled?: boolean
   onRerankingModelEnabledChange?: (value: boolean) => void
diff --git a/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/search-method-option.tsx b/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/search-method-option.tsx
index ae497cf828..28389ca41e 100644
--- a/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/search-method-option.tsx
+++ b/web/app/components/workflow/nodes/knowledge-base/components/retrieval-setting/search-method-option.tsx
@@ -30,9 +30,9 @@ type SearchMethodOptionProps = {
   readonly?: boolean
   option: Option
   hybridSearchModeOptions: HybridSearchModeOption[]
-  searchMethod: RetrievalSearchMethodEnum
+  searchMethod?: RetrievalSearchMethodEnum
   onRetrievalSearchMethodChange: (value: RetrievalSearchMethodEnum) => void
-  hybridSearchMode: HybridSearchModeEnum
+  hybridSearchMode?: HybridSearchModeEnum
   onHybridSearchModeChange: (value: HybridSearchModeEnum) => void
   weightedScore?: WeightedScore
   onWeightedScoreChange: (value: { value: number[] }) => void
diff --git a/web/app/components/workflow/nodes/knowledge-base/default.ts b/web/app/components/workflow/nodes/knowledge-base/default.ts
index 48e2d7fca5..94caf73253 100644
--- a/web/app/components/workflow/nodes/knowledge-base/default.ts
+++ b/web/app/components/workflow/nodes/knowledge-base/default.ts
@@ -1,11 +1,5 @@
 import type { NodeDefault } from '../../types'
 import type { KnowledgeBaseNodeType } from './types'
-import {
-  ChunkStructureEnum,
-  HybridSearchModeEnum,
-  IndexMethodEnum,
-  RetrievalSearchMethodEnum,
-} from './types'
 import { genNodeMetaData } from '@/app/components/workflow/utils'
 import { BlockEnum } from '@/app/components/workflow/types'
 
@@ -17,15 +11,11 @@ const nodeDefault: NodeDefault<KnowledgeBaseNodeType> = {
   metaData,
   defaultValue: {
     index_chunk_variable_selector: [],
-    chunk_structure: ChunkStructureEnum.general,
-    indexing_technique: IndexMethodEnum.QUALIFIED,
     keyword_number: 10,
     retrieval_model: {
-      search_method: RetrievalSearchMethodEnum.hybrid,
       top_k: 2,
       score_threshold_enabled: false,
       score_threshold: 0.5,
-      hybridSearchMode: HybridSearchModeEnum.WeightedScore,
     },
   },
   checkValid() {
diff --git a/web/app/components/workflow/nodes/knowledge-base/panel.tsx b/web/app/components/workflow/nodes/knowledge-base/panel.tsx
index 245c63fd3d..01ed3972c8 100644
--- a/web/app/components/workflow/nodes/knowledge-base/panel.tsx
+++ b/web/app/components/workflow/nodes/knowledge-base/panel.tsx
@@ -75,27 +75,33 @@ const Panel: FC<NodePanelProps<KnowledgeBaseNodeType>> = ({
       </Group>
       <BoxGroup>
         <div className='space-y-3'>
-          <IndexMethod
-            chunkStructure={data.chunk_structure}
-            indexMethod={data.indexing_technique}
-            onIndexMethodChange={handleIndexMethodChange}
-            keywordNumber={data.keyword_number}
-            onKeywordNumberChange={handleKeywordNumberChange}
-            readonly={nodesReadOnly}
-          />
           {
-            data.indexing_technique === IndexMethodEnum.QUALIFIED && (
-              <EmbeddingModel
-                embeddingModel={data.embedding_model}
-                embeddingModelProvider={data.embedding_model_provider}
-                onEmbeddingModelChange={handleEmbeddingModelChange}
-                readonly={nodesReadOnly}
-              />
+            data.chunk_structure && (
+              <>
+                <IndexMethod
+                  chunkStructure={data.chunk_structure}
+                  indexMethod={data.indexing_technique}
+                  onIndexMethodChange={handleIndexMethodChange}
+                  keywordNumber={data.keyword_number}
+                  onKeywordNumberChange={handleKeywordNumberChange}
+                  readonly={nodesReadOnly}
+                />
+                {
+                  data.indexing_technique === IndexMethodEnum.QUALIFIED && (
+                    <EmbeddingModel
+                      embeddingModel={data.embedding_model}
+                      embeddingModelProvider={data.embedding_model_provider}
+                      onEmbeddingModelChange={handleEmbeddingModelChange}
+                      readonly={nodesReadOnly}
+                    />
+                  )
+                }
+                <div className='pt-1'>
+                  <Split className='h-[1px]' />
+                </div>
+              </>
             )
           }
-          <div className='pt-1'>
-            <Split className='h-[1px]' />
-          </div>
           <RetrievalSetting
             indexMethod={data.indexing_technique}
             searchMethod={data.retrieval_model.search_method}
diff --git a/web/app/components/workflow/nodes/knowledge-base/types.ts b/web/app/components/workflow/nodes/knowledge-base/types.ts
index a8f84d31a0..901d84bc90 100644
--- a/web/app/components/workflow/nodes/knowledge-base/types.ts
+++ b/web/app/components/workflow/nodes/knowledge-base/types.ts
@@ -32,19 +32,19 @@ export type WeightedScore = {
 }
 
 export type RetrievalSetting = {
-  search_method: RETRIEVE_METHOD
+  search_method?: RETRIEVE_METHOD
   reranking_enable?: boolean
   reranking_model?: RerankingModel
   weights?: WeightedScore
   top_k: number
   score_threshold_enabled: boolean
   score_threshold: number
-  hybridSearchMode: RerankingModeEnum
+  hybridSearchMode?: RerankingModeEnum
 }
 export type KnowledgeBaseNodeType = CommonNodeType & {
   index_chunk_variable_selector: string[]
-  chunk_structure: ChunkStructureEnum
-  indexing_technique: IndexingType
+  chunk_structure?: ChunkStructureEnum
+  indexing_technique?: IndexingType
   embedding_model?: string
   embedding_model_provider?: string
   keyword_number: number
diff --git a/web/i18n/en-US/workflow.ts b/web/i18n/en-US/workflow.ts
index 3920378cb4..82ea1a9bff 100644
--- a/web/i18n/en-US/workflow.ts
+++ b/web/i18n/en-US/workflow.ts
@@ -891,6 +891,7 @@ const translation = {
     },
     knowledgeBase: {
       chunkStructure: 'Chunk Structure',
+      chooseChunkStructure: 'Choose a chunk structure',
       changeChunkStructure: 'Change Chunk Structure',
       aboutRetrieval: 'about retrieval method.',
     },
diff --git a/web/i18n/zh-Hans/workflow.ts b/web/i18n/zh-Hans/workflow.ts
index 038d19350c..b008485715 100644
--- a/web/i18n/zh-Hans/workflow.ts
+++ b/web/i18n/zh-Hans/workflow.ts
@@ -892,6 +892,7 @@ const translation = {
     },
     knowledgeBase: {
       chunkStructure: '分段结构',
+      chooseChunkStructure: '选择分段结构',
       changeChunkStructure: '更改分段结构',
       aboutRetrieval: '关于知识检索。',
     },