diff --git a/apps/api/src/api/v1/signoz_webhook.py b/apps/api/src/api/v1/signoz_webhook.py
index 3602c282..a4cca676 100644
--- a/apps/api/src/api/v1/signoz_webhook.py
+++ b/apps/api/src/api/v1/signoz_webhook.py
@@ -313,16 +313,28 @@ async def create_signoz_approval(
             action = f"[AI 建議] {analysis_result.action_title}"
         else:
             action = f"SignOz Alert: {alert_name}"
-        approval_request = ApprovalRequestCreate(
-            action=action,
-            description=description,
-            risk_level=analysis_result.risk_level if analysis_result else risk_level,
-            blast_radius=analysis_result.blast_radius if analysis_result else BlastRadius(
+        # 轉換 AIBlastRadius → BlastRadius (兩者欄位相同，enum 型別不同)
+        if analysis_result and analysis_result.blast_radius:
+            ai_br = analysis_result.blast_radius
+            blast_radius = BlastRadius(
+                affected_pods=ai_br.affected_pods,
+                estimated_downtime=ai_br.estimated_downtime,
+                related_services=ai_br.related_services,
+                data_impact=DataImpact(ai_br.data_impact.value),
+            )
+        else:
+            blast_radius = BlastRadius(
                 affected_pods=1,
                 estimated_downtime="0",
                 related_services=[service_name],
                 data_impact=DataImpact.READ_ONLY,
-            ),
+            )
+
+        approval_request = ApprovalRequestCreate(
+            action=action,
+            description=description,
+            risk_level=analysis_result.risk_level if analysis_result else risk_level,
+            blast_radius=blast_radius,
             kubectl_command=command,
             dry_run_checks=[],
             requested_by="signoz-webhook",