diff --git a/.github/workflows/cd.yaml b/.github/workflows/cd.yaml
index e349a1dc..55c91474 100644
--- a/.github/workflows/cd.yaml
+++ b/.github/workflows/cd.yaml
@@ -55,6 +55,12 @@ jobs:
     runs-on: [self-hosted, harbor, k8s]
     timeout-minutes: 1
     steps:
+      # Phase 16: 清理 Runner diag logs 避免 "file already exists" 錯誤
+      - name: Clean runner diag logs
+        run: |
+          rm -f ~/actions-runner-awoooi/_diag/pages/*.log 2>/dev/null || true
+          rm -f ~/actions-runner-awoooi-2/_diag/pages/*.log 2>/dev/null || true
+
       - name: "Check Required Secrets"
         run: |
           MISSING=""
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 77151097..5a2b21bb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -31,6 +31,12 @@ jobs:
     runs-on: [self-hosted, harbor, k8s]
     timeout-minutes: 1
     steps:
+      # Phase 16: 清理 Runner diag logs 避免 "file already exists" 錯誤
+      - name: Clean runner diag logs
+        run: |
+          rm -f ~/actions-runner-awoooi/_diag/pages/*.log 2>/dev/null || true
+          rm -f ~/actions-runner-awoooi-2/_diag/pages/*.log 2>/dev/null || true
+
       - name: Quick sanity check
         run: |
           echo "✅ Runner 可用"