diff --git a/apps/api/src/services/decision_manager.py b/apps/api/src/services/decision_manager.py
index 86bbb13fe..059ce9625 100644
--- a/apps/api/src/services/decision_manager.py
+++ b/apps/api/src/services/decision_manager.py
@@ -585,32 +585,54 @@ class DecisionManager:
         incident: Incident,
     ) -> dict[str, Any]:
         """
-        三軌決策分析 (Phase 7.5 升級)
+        三軌決策分析 (Phase 7.5 升級 + 2026-03-27 智能診斷重構)
 
         策略:
         1. 先檢查 Playbook 是否有高度匹配 (similarity >= 85%)
         2. Playbook 命中則直接使用 (最快、經驗驗證)
-        3. 否則 LLM + Expert System 雙軌
+        3. Expert System 提供初步診斷 (分類 + 診斷指令)
+        4. LLM 基於診斷上下文提供智能建議
+        5. LLM 失敗時，根據 Expert 診斷決定是否需人工介入
 
-        優先順序: Playbook > LLM > Expert System
+        優先順序: Playbook > LLM(with Expert context) > Expert System
         """
         # Phase 7.5: 先嘗試 Playbook 匹配
         playbook_result = await self._try_playbook_match(incident)
         if playbook_result:
             return playbook_result
 
-        # Expert System 同步執行 (立即可用)
+        # ========== 2026-03-27 重構: 分層智能診斷 ==========
+
+        # Step 1: Expert System 提供初步診斷 (永不失敗)
         expert_result = expert_analyze(incident)
 
-        # LLM 非同步執行
-        try:
-            signals_dict = [s.model_dump() for s in incident.signals]
+        # Step 2: 測試資源直接返回 (不浪費 LLM 呼叫)
+        if expert_result.get("is_test_resource"):
+            logger.info(
+                "dual_engine_test_resource_skip",
+                incident_id=incident.incident_id,
+                target=incident.affected_services[0] if incident.affected_services else "unknown",
+            )
+            return expert_result
 
+        # Step 3: 準備 LLM 上下文 (含 Expert 診斷)
+        signals_dict = [s.model_dump() for s in incident.signals]
+        expert_context = {
+            "initial_diagnosis": expert_result.get("matched_rule"),
+            "diagnosis_description": expert_result.get("description"),
+            "suggested_diagnosis_commands": expert_result.get("diagnosis_commands", []),
+            "expert_confidence": expert_result.get("confidence"),
+            "requires_human_review": expert_result.get("human_review_required", False),
+        }
+
+        # Step 4: LLM 分析 (帶上 Expert 上下文)
+        try:
             llm_result, provider, success = await self._openclaw.generate_incident_proposal(
                 incident_id=incident.incident_id,
                 severity=incident.severity.value,
                 signals=signals_dict,
                 affected_services=incident.affected_services,
+                expert_context=expert_context,  # 傳遞 Expert 診斷上下文
             )
 
             if success and llm_result:
@@ -618,10 +640,12 @@ class DecisionManager:
                     "dual_engine_llm_win",
                     incident_id=incident.incident_id,
                     provider=provider,
+                    expert_rule=expert_result.get("matched_rule"),
                 )
                 return {
                     **llm_result,
                     "source": f"llm_{provider}",
+                    "expert_diagnosis": expert_result.get("matched_rule"),
                 }
 
         except Exception as e:
@@ -629,13 +653,23 @@ class DecisionManager:
                 "dual_engine_llm_failed",
                 incident_id=incident.incident_id,
                 error=str(e),
+                expert_rule=expert_result.get("matched_rule"),
             )
 
-        # LLM 失敗，使用 Expert System
+        # Step 5: LLM 失敗，使用 Expert System 結果
+        # 但根據診斷結果調整回應
         logger.info(
             "dual_engine_expert_fallback",
             incident_id=incident.incident_id,
+            expert_rule=expert_result.get("matched_rule"),
+            human_review=expert_result.get("human_review_required", False),
         )
+
+        # 如果 Expert 標記需人工介入，降低 confidence
+        if expert_result.get("human_review_required"):
+            expert_result["confidence"] = min(expert_result.get("confidence", 0.5), 0.5)
+            expert_result["description"] += " [LLM 分析失敗，建議人工確認]"
+
         return expert_result
 
     async def _try_playbook_match(
diff --git a/apps/api/src/services/openclaw.py b/apps/api/src/services/openclaw.py
index dd7a7f314..9b05a1fc3 100644
--- a/apps/api/src/services/openclaw.py
+++ b/apps/api/src/services/openclaw.py
@@ -1068,17 +1068,25 @@ Trace URL: {signoz_trace_url}
         severity: str,
         signals: list[dict],
         affected_services: list[str],
+        expert_context: dict | None = None,
     ) -> tuple[dict | None, str, bool]:
         """
         為 Incident 生成 LLM-based 修復提案
 
         Phase 6.4: 賦予大腦「生成解決方案」的思考能力
+        2026-03-27: 整合 Expert System 診斷上下文
 
         Args:
             incident_id: Incident ID
             severity: 嚴重度 (P0/P1/P2/P3)
             signals: 關聯的告警訊號
             affected_services: 受影響服務
+            expert_context: Expert System 初步診斷 (可選)
+                - initial_diagnosis: 規則匹配結果
+                - diagnosis_description: 診斷描述
+                - suggested_diagnosis_commands: 建議診斷指令
+                - expert_confidence: 信心分數
+                - requires_human_review: 是否需人工介入
 
         Returns:
             (proposal_dict, provider, success)
@@ -1108,11 +1116,31 @@ Trace URL: {signoz_trace_url}
             signoz_context = f"""
 ## 📊 SignOz Real-time Metrics
 {signoz_metrics.to_summary()}
+"""
+
+        # 2026-03-27: 整合 Expert System 診斷上下文
+        expert_diagnosis_context = ""
+        if expert_context:
+            diagnosis_cmds = expert_context.get("suggested_diagnosis_commands", [])
+            diagnosis_cmds_str = "\n".join([f"  - `{cmd}`" for cmd in diagnosis_cmds]) if diagnosis_cmds else "  - (無)"
+            expert_diagnosis_context = f"""
+## 🔍 Expert System Initial Diagnosis
+- **Matched Rule**: {expert_context.get('initial_diagnosis', 'unknown')}
+- **Diagnosis**: {expert_context.get('diagnosis_description', 'N/A')}
+- **Confidence**: {expert_context.get('expert_confidence', 0.5):.0%}
+- **Requires Human Review**: {'Yes' if expert_context.get('requires_human_review') else 'No'}
+- **Suggested Diagnosis Commands**:
+{diagnosis_cmds_str}
+
+**IMPORTANT**: The Expert System has provided an initial diagnosis.
+Consider this context but apply your own analysis. If Expert says "human review required",
+provide diagnostic guidance rather than automated fixes.
 """
 
         proposal_prompt = f"""{OPENCLAW_SYSTEM_PROMPT}
 
 {signoz_context}
+{expert_diagnosis_context}
 
 ## 🚨 Incident Context
 - **Incident ID**: {incident_id}
@@ -1124,13 +1152,14 @@ Trace URL: {signoz_trace_url}
 {signal_summary}
 
 ## 🎯 Your Task
-Based on the above incident and signals, generate a remediation proposal.
+Based on the above incident, signals, and Expert System diagnosis, generate a remediation proposal.
 You MUST respond with ONLY valid JSON following the schema above.
 Focus on:
-1. Root cause analysis based on signals and SignOz data
-2. Specific kubectl command to remediate
+1. Root cause analysis based on signals, SignOz data, and Expert diagnosis
+2. Specific kubectl command to remediate (or diagnostic command if root cause unclear)
 3. Risk assessment for the proposed action
 4. Preventive recommendations
+5. If Expert System flagged "human review required", prioritize diagnostic commands over fixes
 """
 
         logger.info(