diff --git a/web/app/components/rag-pipeline/hooks/use-available-nodes-meta-data.ts b/web/app/components/rag-pipeline/hooks/use-available-nodes-meta-data.ts
index 3dad34f441..6ce4524c8e 100644
--- a/web/app/components/rag-pipeline/hooks/use-available-nodes-meta-data.ts
+++ b/web/app/components/rag-pipeline/hooks/use-available-nodes-meta-data.ts
@@ -19,26 +19,9 @@ export const useAvailableNodesMetaData = () => {
         ...dataSourceDefault.defaultValue,
         _dataSourceStartToAdd: true,
       },
-      metaData: {
-        ...dataSourceDefault.metaData,
-        isStart: true,
-        isRequired: true,
-      },
-    },
-    {
-      ...knowledgeBaseDefault,
-      metaData: {
-        ...knowledgeBaseDefault.metaData,
-        isRequired: true,
-      },
-    },
-    {
-      ...dataSourceEmptyDefault,
-      metaData: {
-        ...dataSourceEmptyDefault.metaData,
-        isUndeletable: true,
-      },
     },
+    knowledgeBaseDefault,
+    dataSourceEmptyDefault,
   ], [])
 
   const prefixLink = useMemo(() => {
diff --git a/web/app/components/workflow-app/hooks/use-available-nodes-meta-data.ts b/web/app/components/workflow-app/hooks/use-available-nodes-meta-data.ts
index 983d598573..f590c1a8ce 100644
--- a/web/app/components/workflow-app/hooks/use-available-nodes-meta-data.ts
+++ b/web/app/components/workflow-app/hooks/use-available-nodes-meta-data.ts
@@ -15,35 +15,11 @@ export const useAvailableNodesMetaData = () => {
 
   const mergedNodesMetaData = useMemo(() => [
     ...WORKFLOW_COMMON_NODES,
-    {
-      ...StartDefault,
-      metaData: {
-        ...StartDefault.metaData,
-        isStart: true,
-        isRequired: true,
-        isUndeletable: true,
-      },
-    },
+    StartDefault,
     ...(
       isChatMode
-        ? [
-            {
-              ...AnswerDefault,
-              metaData: {
-                ...AnswerDefault.metaData,
-                isRequired: true,
-              },
-            },
-          ]
-        : [
-            {
-              ...EndDefault,
-              metaData: {
-                ...EndDefault.metaData,
-                isRequired: true,
-              },
-            },
-          ]
+        ? [AnswerDefault]
+        : [EndDefault]
     ),
   ], [isChatMode])
 
diff --git a/web/app/components/workflow/hooks/use-nodes-interactions.ts b/web/app/components/workflow/hooks/use-nodes-interactions.ts
index 3f1fd56df1..023f3a7470 100644
--- a/web/app/components/workflow/hooks/use-nodes-interactions.ts
+++ b/web/app/components/workflow/hooks/use-nodes-interactions.ts
@@ -1256,15 +1256,26 @@ export const useNodesInteractions = () => {
     }
     else {
       // If no nodeId is provided, fall back to the current behavior
-      const bundledNodes = nodes.filter(node => node.data._isBundled && node.data.type !== BlockEnum.Start && node.data.type !== BlockEnum.DataSource && node.data.type !== BlockEnum.KnowledgeBase && node.data.type !== BlockEnum.DataSourceEmpty
-        && !node.data.isInIteration && !node.data.isInLoop)
+      const bundledNodes = nodes.filter((node) => {
+        if (!node.data._isBundled)
+          return false
+        const { metaData } = nodesMetaDataMap![node.data.type as BlockEnum]
+        if (metaData.isSingleton)
+          return false
+        return !node.data.isInIteration && !node.data.isInLoop
+      })
 
       if (bundledNodes.length) {
         setClipboardElements(bundledNodes)
         return
       }
 
-      const selectedNode = nodes.find(node => node.data.selected && node.data.type !== BlockEnum.Start && node.data.type !== BlockEnum.LoopEnd && node.data.type !== BlockEnum.DataSource)
+      const selectedNode = nodes.find((node) => {
+        if (!node.data.selected)
+          return false
+        const { metaData } = nodesMetaDataMap![node.data.type as BlockEnum]
+        return !metaData.isSingleton
+      })
 
       if (selectedNode)
         setClipboardElements([selectedNode])
diff --git a/web/app/components/workflow/nodes/_base/components/panel-operator/panel-operator-popup.tsx b/web/app/components/workflow/nodes/_base/components/panel-operator/panel-operator-popup.tsx
index 75abdd6d12..a871e60e3a 100644
--- a/web/app/components/workflow/nodes/_base/components/panel-operator/panel-operator-popup.tsx
+++ b/web/app/components/workflow/nodes/_base/components/panel-operator/panel-operator-popup.tsx
@@ -16,7 +16,6 @@ import {
 } from '@/app/components/workflow/hooks'
 import ShortcutsName from '@/app/components/workflow/shortcuts-name'
 import type { Node } from '@/app/components/workflow/types'
-import { BlockEnum } from '@/app/components/workflow/types'
 
 type PanelOperatorPopupProps = {
   id: string
@@ -43,7 +42,7 @@ const PanelOperatorPopup = ({
   const { nodesReadOnly } = useNodesReadOnly()
   const edge = edges.find(edge => edge.target === id)
   const nodeMetaData = useNodeMetaData({ id, data } as Node)
-  const showChangeBlock = data.type !== BlockEnum.Start && !nodesReadOnly && data.type !== BlockEnum.Iteration && data.type !== BlockEnum.Loop
+  const showChangeBlock = !nodeMetaData.isTypeFixed && !nodesReadOnly
   const isChildNode = !!(data.isInIteration || data.isInLoop)
 
   return (
@@ -85,31 +84,37 @@ const PanelOperatorPopup = ({
         )
       }
       {
-        data.type !== BlockEnum.Start && !nodesReadOnly && (
+        !nodesReadOnly && (
           <>
-            <div className='p-1'>
-              <div
-                className='flex h-8 cursor-pointer items-center justify-between rounded-lg px-3 text-sm text-text-secondary hover:bg-state-base-hover'
-                onClick={() => {
-                  onClosePopup()
-                  handleNodesCopy(id)
-                }}
-              >
-                {t('workflow.common.copy')}
-                <ShortcutsName keys={['ctrl', 'c']} />
-              </div>
-              <div
-                className='flex h-8 cursor-pointer items-center justify-between rounded-lg px-3 text-sm text-text-secondary hover:bg-state-base-hover'
-                onClick={() => {
-                  onClosePopup()
-                  handleNodesDuplicate(id)
-                }}
-              >
-                {t('workflow.common.duplicate')}
-                <ShortcutsName keys={['ctrl', 'd']} />
-              </div>
-            </div>
-            <div className='h-px bg-divider-regular'></div>
+            {
+              !nodeMetaData.isSingleton && (
+                <>
+                  <div className='p-1'>
+                    <div
+                      className='flex h-8 cursor-pointer items-center justify-between rounded-lg px-3 text-sm text-text-secondary hover:bg-state-base-hover'
+                      onClick={() => {
+                        onClosePopup()
+                        handleNodesCopy(id)
+                      }}
+                    >
+                      {t('workflow.common.copy')}
+                      <ShortcutsName keys={['ctrl', 'c']} />
+                    </div>
+                    <div
+                      className='flex h-8 cursor-pointer items-center justify-between rounded-lg px-3 text-sm text-text-secondary hover:bg-state-base-hover'
+                      onClick={() => {
+                        onClosePopup()
+                        handleNodesDuplicate(id)
+                      }}
+                    >
+                      {t('workflow.common.duplicate')}
+                      <ShortcutsName keys={['ctrl', 'd']} />
+                    </div>
+                  </div>
+                  <div className='h-px bg-divider-regular'></div>
+                </>
+              )
+            }
             {
               !nodeMetaData.isUndeletable && (
                 <>
@@ -117,7 +122,7 @@ const PanelOperatorPopup = ({
                     <div
                       className={`
                       flex h-8 cursor-pointer items-center justify-between rounded-lg px-3 text-sm text-text-secondary
-                      hover:bg-state-destructive-hover hover:text-red-500
+                      hover:bg-state-destructive-hover hover:text-text-destructive
                       `}
                       onClick={() => handleNodeDelete(id)}
                     >
diff --git a/web/app/components/workflow/nodes/answer/default.ts b/web/app/components/workflow/nodes/answer/default.ts
index d3cb2c6741..f115274900 100644
--- a/web/app/components/workflow/nodes/answer/default.ts
+++ b/web/app/components/workflow/nodes/answer/default.ts
@@ -6,6 +6,7 @@ import { BlockEnum } from '@/app/components/workflow/types'
 const metaData = genNodeMetaData({
   sort: 2.1,
   type: BlockEnum.Answer,
+  isRequired: true,
 })
 const nodeDefault: NodeDefault<AnswerNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/nodes/data-source-empty/default.ts b/web/app/components/workflow/nodes/data-source-empty/default.ts
index df7c5e853e..69d9904217 100644
--- a/web/app/components/workflow/nodes/data-source-empty/default.ts
+++ b/web/app/components/workflow/nodes/data-source-empty/default.ts
@@ -6,6 +6,8 @@ import { BlockEnum } from '@/app/components/workflow/types'
 const metaData = genNodeMetaData({
   sort: -1,
   type: BlockEnum.DataSourceEmpty,
+  isUndeletable: true,
+  isSingleton: true,
 })
 const nodeDefault: NodeDefault<DataSourceEmptyNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/nodes/data-source/default.ts b/web/app/components/workflow/nodes/data-source/default.ts
index f5ebb27655..82e69679a2 100644
--- a/web/app/components/workflow/nodes/data-source/default.ts
+++ b/web/app/components/workflow/nodes/data-source/default.ts
@@ -15,6 +15,8 @@ const i18nPrefix = 'workflow.errorMsg'
 const metaData = genNodeMetaData({
   sort: -1,
   type: BlockEnum.DataSource,
+  isStart: true,
+  isRequired: true,
 })
 const nodeDefault: NodeDefault<DataSourceNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/nodes/end/default.ts b/web/app/components/workflow/nodes/end/default.ts
index 32e4f1051d..cadb580c34 100644
--- a/web/app/components/workflow/nodes/end/default.ts
+++ b/web/app/components/workflow/nodes/end/default.ts
@@ -6,6 +6,7 @@ import { BlockEnum } from '@/app/components/workflow/types'
 const metaData = genNodeMetaData({
   sort: 2.1,
   type: BlockEnum.End,
+  isRequired: true,
 })
 const nodeDefault: NodeDefault<EndNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/nodes/iteration/default.ts b/web/app/components/workflow/nodes/iteration/default.ts
index 3c348a4fe0..450379ec6b 100644
--- a/web/app/components/workflow/nodes/iteration/default.ts
+++ b/web/app/components/workflow/nodes/iteration/default.ts
@@ -9,6 +9,7 @@ const metaData = genNodeMetaData({
   classification: BlockClassificationEnum.Logic,
   sort: 2,
   type: BlockEnum.Iteration,
+  isTypeFixed: true,
 })
 const nodeDefault: NodeDefault<IterationNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/nodes/knowledge-base/default.ts b/web/app/components/workflow/nodes/knowledge-base/default.ts
index e43c08778f..8175e2ac9e 100644
--- a/web/app/components/workflow/nodes/knowledge-base/default.ts
+++ b/web/app/components/workflow/nodes/knowledge-base/default.ts
@@ -6,6 +6,10 @@ import { BlockEnum } from '@/app/components/workflow/types'
 const metaData = genNodeMetaData({
   sort: 3.1,
   type: BlockEnum.KnowledgeBase,
+  isRequired: true,
+  isUndeletable: true,
+  isSingleton: true,
+  isTypeFixed: true,
 })
 const nodeDefault: NodeDefault<KnowledgeBaseNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/nodes/loop-end/default.ts b/web/app/components/workflow/nodes/loop-end/default.ts
index c02d007cde..bb46ff1166 100644
--- a/web/app/components/workflow/nodes/loop-end/default.ts
+++ b/web/app/components/workflow/nodes/loop-end/default.ts
@@ -10,6 +10,7 @@ const metaData = genNodeMetaData({
   classification: BlockClassificationEnum.Logic,
   sort: 2,
   type: BlockEnum.LoopEnd,
+  isSingleton: true,
 })
 const nodeDefault: NodeDefault<SimpleNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/nodes/loop/default.ts b/web/app/components/workflow/nodes/loop/default.ts
index 0a80763001..390545d0e2 100644
--- a/web/app/components/workflow/nodes/loop/default.ts
+++ b/web/app/components/workflow/nodes/loop/default.ts
@@ -14,6 +14,7 @@ const metaData = genNodeMetaData({
   sort: 3,
   type: BlockEnum.Loop,
   author: 'AICT-Team',
+  isTypeFixed: true,
 })
 const nodeDefault: NodeDefault<LoopNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/nodes/start/default.ts b/web/app/components/workflow/nodes/start/default.ts
index 8337c2275f..3b98b57a73 100644
--- a/web/app/components/workflow/nodes/start/default.ts
+++ b/web/app/components/workflow/nodes/start/default.ts
@@ -6,6 +6,11 @@ import { BlockEnum } from '@/app/components/workflow/types'
 const metaData = genNodeMetaData({
   sort: 0.1,
   type: BlockEnum.Start,
+  isStart: true,
+  isRequired: true,
+  isUndeletable: true,
+  isSingleton: true,
+  isTypeFixed: true,
 })
 const nodeDefault: NodeDefault<StartNodeType> = {
   metaData,
diff --git a/web/app/components/workflow/types.ts b/web/app/components/workflow/types.ts
index bfae195a0e..f5ff7d5ce8 100644
--- a/web/app/components/workflow/types.ts
+++ b/web/app/components/workflow/types.ts
@@ -329,6 +329,8 @@ export type NodeDefault<T = {}> = {
     isRequired?: boolean
     isUndeletable?: boolean
     isStart?: boolean
+    isSingleton?: boolean
+    isTypeFixed?: boolean
   }
   defaultValue: Partial<T>
   defaultRunInputData?: Record<string, any>
diff --git a/web/app/components/workflow/utils/gen-node-meta-data.ts b/web/app/components/workflow/utils/gen-node-meta-data.ts
index e7271cfcc4..9c4e9cabca 100644
--- a/web/app/components/workflow/utils/gen-node-meta-data.ts
+++ b/web/app/components/workflow/utils/gen-node-meta-data.ts
@@ -8,6 +8,11 @@ export type GenNodeMetaDataParams = {
   title?: string
   author?: string
   helpLinkUri?: string
+  isRequired?: boolean
+  isUndeletable?: boolean
+  isStart?: boolean
+  isSingleton?: boolean
+  isTypeFixed?: boolean
 }
 export const genNodeMetaData = ({
   classification = BlockClassificationEnum.Default,
@@ -16,6 +21,11 @@ export const genNodeMetaData = ({
   title = '',
   author = 'Dify',
   helpLinkUri,
+  isRequired = false,
+  isUndeletable = false,
+  isStart = false,
+  isSingleton = false,
+  isTypeFixed = false,
 }: GenNodeMetaDataParams) => {
   return {
     classification,
@@ -24,5 +34,10 @@ export const genNodeMetaData = ({
     title,
     author,
     helpLinkUri: helpLinkUri || type,
+    isRequired,
+    isUndeletable,
+    isStart,
+    isSingleton,
+    isTypeFixed,
   }
 }