diff --git a/web/app/dashboard/ai-workflows/_components/flowgram-node-registries.tsx b/web/app/dashboard/ai-workflows/_components/flowgram-node-registries.tsx
index 621c384..4d2b717 100644
--- a/web/app/dashboard/ai-workflows/_components/flowgram-node-registries.tsx
+++ b/web/app/dashboard/ai-workflows/_components/flowgram-node-registries.tsx
@@ -1,5 +1,5 @@
 import { Field, type WorkflowNodeRegistry } from "@flowgram.ai/free-layout-editor"
-import { PlusIcon } from "lucide-react"
+import { PlusIcon, XIcon } from "lucide-react"
 
 import { Button } from "@/components/ui/button"
 import type { AIWorkflowNodeSpec } from "@/lib/api/admin"
@@ -99,6 +99,9 @@ function ConditionNodeForm({ fallbackTitle }: { fallbackTitle: string }) {
               branches: ensureConditionBranches(nextBranches),
             })
           }
+          const deleteBranch = (branchId: string) => {
+            updateBranches(branches.filter((branch) => branch.id !== branchId))
+          }
 
           return (
             <div className="px-4 py-3">
@@ -114,6 +117,19 @@ function ConditionNodeForm({ fallbackTitle }: { fallbackTitle: string }) {
                     <span className="shrink-0 rounded-sm bg-[#e7e9f3] px-1.5 py-0.5 text-[10px] font-medium text-muted-foreground">
                       {branch.default ? "else" : index === 0 ? "if" : "elseif"}
                     </span>
+                    {branch.default ? null : (
+                      <button
+                        type="button"
+                        className="flex size-5 shrink-0 items-center justify-center rounded-sm text-muted-foreground transition-colors hover:bg-destructive/10 hover:text-destructive"
+                        aria-label={`删除条件 ${branch.name || branch.id}`}
+                        onClick={(event) => {
+                          event.stopPropagation()
+                          deleteBranch(branch.id)
+                        }}
+                      >
+                        <XIcon className="size-3.5" />
+                      </button>
+                    )}
                     <span
                       data-port-id={branch.id}
                       data-port-type="output"
diff --git a/web/app/dashboard/ai-workflows/_components/node-config-panel.tsx b/web/app/dashboard/ai-workflows/_components/node-config-panel.tsx
index d67346c..7c59b6e 100644
--- a/web/app/dashboard/ai-workflows/_components/node-config-panel.tsx
+++ b/web/app/dashboard/ai-workflows/_components/node-config-panel.tsx
@@ -274,15 +274,17 @@ function ConditionBranchesEditor({
                   className="h-8"
                   onChange={(event) => onChange({ ...branch, name: event.target.value })}
                 />
-                <Button
-                  type="button"
-                  variant="ghost"
-                  size="sm"
-                  className="h-8 px-2 text-xs text-muted-foreground hover:text-destructive"
-                  onClick={() => onDelete(branch.id)}
-                >
-                  删除
-                </Button>
+                {branch.default ? null : (
+                  <Button
+                    type="button"
+                    variant="ghost"
+                    size="sm"
+                    className="h-8 px-2 text-xs text-muted-foreground hover:text-destructive"
+                    onClick={() => onDelete(branch.id)}
+                  >
+                    删除
+                  </Button>
+                )}
               </div>
 
               <div className="space-y-1.5">
diff --git a/web/app/dashboard/ai-workflows/_components/workflow-utils.ts b/web/app/dashboard/ai-workflows/_components/workflow-utils.ts
index 4ee0c86..3894e3a 100644
--- a/web/app/dashboard/ai-workflows/_components/workflow-utils.ts
+++ b/web/app/dashboard/ai-workflows/_components/workflow-utils.ts
@@ -241,18 +241,32 @@ export function deleteConditionBranch(
     return definition
   }
   const config = normalizeNodeConfig(node.data?.config)
-  return updateWorkflowNodeData(definition, nodeId, {
+  const nextDefinition = updateWorkflowNodeData(definition, nodeId, {
     ...(node.data ?? {}),
     config: {
       ...config,
       branches: (config.branches ?? []).filter((branch) => branch.id !== branchId),
     },
   })
+  return {
+    ...nextDefinition,
+    edges: nextDefinition.edges.filter((edge) => !(edge.sourceNodeID === nodeId && edge.sourcePortID === branchId)),
+  }
 }
 
 export function normalizeConditionPortsForFlowgram(
   definition: AIWorkflowDefinition
 ): AIWorkflowDefinition {
+  const branchIdsByNodeId = new Map<string, Set<string>>()
+  for (const node of definition.nodes) {
+    if (node.type !== "condition") {
+      continue
+    }
+    const config = normalizeNodeConfig(node.data?.config)
+    const branches = ensureConditionBranches(config.branches ?? [])
+    branchIdsByNodeId.set(node.id, new Set(branches.map((branch) => branch.id)))
+  }
+
   return {
     ...definition,
     nodes: definition.nodes.map((node) => {
@@ -271,7 +285,13 @@ export function normalizeConditionPortsForFlowgram(
         },
       }
     }),
-    edges: definition.edges.map((edge) => {
+    edges: definition.edges.filter((edge) => {
+      if (!edge.sourcePortID) {
+        return true
+      }
+      const branchIds = branchIdsByNodeId.get(edge.sourceNodeID)
+      return !branchIds || branchIds.has(edge.sourcePortID)
+    }).map((edge) => {
       const source = definition.nodes.find((node) => node.id === edge.sourceNodeID)
       if (!source || source.type !== "condition" || edge.sourcePortID) {
         return edge