diff --git a/backend-fastapi/ai_platform/fixtures/multica_org_agents.json b/backend-fastapi/ai_platform/fixtures/multica_org_agents.json
index 6162eb3..dfb41de 100644
--- a/backend-fastapi/ai_platform/fixtures/multica_org_agents.json
+++ b/backend-fastapi/ai_platform/fixtures/multica_org_agents.json
@@ -80,7 +80,7 @@
           "initialized": false,
           "position": {
             "x": 160,
-            "y": -150
+            "y": 0
           },
           "data": {
             "label": "需求分析",
@@ -95,8 +95,8 @@
           "type": "template",
           "initialized": false,
           "position": {
-            "x": 160,
-            "y": 70
+            "x": 500,
+            "y": 0
           },
           "data": {
             "label": "架构方案",
@@ -111,8 +111,8 @@
           "type": "parallel",
           "initialized": false,
           "position": {
-            "x": 520,
-            "y": -40
+            "x": 840,
+            "y": 0
           },
           "data": {
             "label": "并行实现分派",
@@ -299,31 +299,14 @@
           "deletable": true
         },
         {
-          "id": "pm_triage-architecture_plan",
-          "type": "addButton",
-          "source": "pm_triage",
-          "target": "architecture_plan",
-          "data": {
-            "label": "澄清后设计方案"
-          },
-          "label": "澄清后设计方案",
-          "animated": false,
-          "style": {
-            "strokeWidth": 2,
-            "stroke": "#94a3b8"
-          },
-          "markerEnd": "arrowclosed",
-          "deletable": true
-        },
-        {
-          "id": "requirements_analysis-parallel_delivery",
+          "id": "requirements_analysis-architecture_plan",
           "type": "addButton",
           "source": "requirements_analysis",
-          "target": "parallel_delivery",
+          "target": "architecture_plan",
           "data": {
-            "label": "需求输入"
+            "label": "需求输入架构"
           },
-          "label": "需求输入",
+          "label": "需求输入架构",
           "animated": false,
           "style": {
             "strokeWidth": 2,
@@ -353,6 +336,7 @@
           "id": "parallel_delivery-frontend_delivery",
           "type": "addButton",
           "source": "parallel_delivery",
+          "sourceHandle": "frontend",
           "target": "frontend_delivery",
           "data": {
             "label": "前端分支"
@@ -370,6 +354,7 @@
           "id": "parallel_delivery-backend_delivery",
           "type": "addButton",
           "source": "parallel_delivery",
+          "sourceHandle": "backend",
           "target": "backend_delivery",
           "data": {
             "label": "后端分支"
@@ -387,6 +372,7 @@
           "id": "parallel_delivery-ops_prepare",
           "type": "addButton",
           "source": "parallel_delivery",
+          "sourceHandle": "ops",
           "target": "ops_prepare",
           "data": {
             "label": "发布分支"
diff --git a/backend-fastapi/scripts/seed_multica_org_agents.py b/backend-fastapi/scripts/seed_multica_org_agents.py
index 615ebe9..0720039 100644
--- a/backend-fastapi/scripts/seed_multica_org_agents.py
+++ b/backend-fastapi/scripts/seed_multica_org_agents.py
@@ -57,7 +57,16 @@ def validate_fixture(fixture: Dict[str, Any]) -> Dict[str, int]:
         for node in nodes
         if isinstance(node, dict) and (node.get("data") or {}).get("agent_code")
     }
+    node_by_id = {node.get("id"): node for node in nodes if isinstance(node, dict)}
     node_types = {node.get("type") for node in nodes}
+    outgoing_edges: Dict[str, list[str]] = {}
+    for edge in edges:
+        if not isinstance(edge, dict):
+            continue
+        source = edge.get("source")
+        target = edge.get("target")
+        if source and target:
+            outgoing_edges.setdefault(source, []).append(target)
 
     required_persona_fields = {
         "role",
@@ -67,6 +76,7 @@ def validate_fixture(fixture: Dict[str, Any]) -> Dict[str, int]:
         "examples",
     }
     required_node_types = {"start", "end", "template", "parallel", "merge"}
+    multi_outgoing_node_types = {"parallel", "condition", "intent", "choice"}
 
     missing_workflow_agents = sorted(workflow_agent_codes - agent_codes)
     missing_persona_fields = {
@@ -75,6 +85,12 @@ def validate_fixture(fixture: Dict[str, Any]) -> Dict[str, int]:
         if required_persona_fields - set((agent.get("persona") or {}).keys())
     }
     missing_node_types = sorted(required_node_types - node_types)
+    invalid_multi_outgoing = {
+        source: targets
+        for source, targets in outgoing_edges.items()
+        if len(targets) > 1
+        and (node_by_id.get(source) or {}).get("type") not in multi_outgoing_node_types
+    }
     project_manager = next(
         (agent for agent in agents if agent.get("code") == "project_manager"),
         None,
@@ -84,12 +100,14 @@ def validate_fixture(fixture: Dict[str, Any]) -> Dict[str, int]:
         missing_workflow_agents
         or missing_persona_fields
         or missing_node_types
+        or invalid_multi_outgoing
         or project_manager_workflow != "multica_org_collaboration_flow"
     ):
         raise ValueError(
             f"Fixture validation failed: missing_workflow_agents={missing_workflow_agents}, "
             f"missing_persona_fields={missing_persona_fields}, "
             f"missing_node_types={missing_node_types}, "
+            f"invalid_multi_outgoing={invalid_multi_outgoing}, "
             f"project_manager_workflow={project_manager_workflow}"
         )