diff --git a/git-hangman-lab/scripts/pr b/git-hangman-lab/scripts/pr
index 3a5b35a..975185e 100755
--- a/git-hangman-lab/scripts/pr
+++ b/git-hangman-lab/scripts/pr
@@ -180,27 +180,61 @@ cmd_merge() {
       merge_when_checks_succeed: true
     }')
 
-  RESPONSE=$(curl -s -X POST "https://git.hangman-lab.top/api/v1/repos/${OWNER}/${REPO_NAME}/pulls/${pr_index}/merge" \
+  TEMP_FILE=$(mktemp)
+  HTTP_CODE=$(curl -s -o "$TEMP_FILE" -w "%{http_code}" -X POST "https://git.hangman-lab.top/api/v1/repos/${OWNER}/${REPO_NAME}/pulls/${pr_index}/merge" \
     -H 'accept: application/json' \
     -H 'Content-Type: application/json' \
     -H "Authorization: token ${token}" \
     -d "$json")
 
-  if echo "$RESPONSE" | jq -e '.message' >/dev/null 2>&1; then
-    ERROR_MSG=$(echo "$RESPONSE" | jq -r '.message')
-    echo "Error: $ERROR_MSG"
-    exit 1
-  fi
+  RESPONSE=$(cat "$TEMP_FILE")
+  rm -f "$TEMP_FILE"
 
-  MERGED=$(echo "$RESPONSE" | jq -r '.merged')
-
-  if [[ "$MERGED" == "true" ]]; then
-    echo "Pull request merged successfully!"
-  else
-    echo "Error: Failed to merge pull request"
-    echo "$RESPONSE" | jq '.'
-    exit 1
-  fi
+  case "$HTTP_CODE" in
+    200)
+      MERGED=$(echo "$RESPONSE" | jq -r '.merged')
+      if [[ "$MERGED" == "true" ]]; then
+        echo "Pull request merged successfully!"
+      else
+        echo "Error: Failed to merge pull request"
+        echo "$RESPONSE" | jq '.'
+        exit 1
+      fi
+      ;;
+    409)
+      ERROR_MSG=$(echo "$RESPONSE" | jq -r '.message // "Conflicting changes"')
+      echo "Error [$HTTP_CODE]: $ERROR_MSG"
+      exit 1
+      ;;
+    404)
+      ERROR_MSG=$(echo "$RESPONSE" | jq -r '.message // "Not found"')
+      echo "Error [$HTTP_CODE]: $ERROR_MSG"
+      exit 1
+      ;;
+    423)
+      ERROR_MSG=$(echo "$RESPONSE" | jq -r '.message // "Repository is archived"')
+      echo "Error [$HTTP_CODE]: $ERROR_MSG"
+      exit 1
+      ;;
+    405)
+      ERROR_MSG=$(echo "$RESPONSE" | jq -r '.message // empty')
+      if [[ -n "$ERROR_MSG" && "$ERROR_MSG" != "null" ]]; then
+        echo "Error [$HTTP_CODE]: $ERROR_MSG"
+      else
+        echo "Error [$HTTP_CODE]: Please try again later"
+      fi
+      exit 1
+      ;;
+    *)
+      if echo "$RESPONSE" | jq -e '.message' >/dev/null 2>&1; then
+        ERROR_MSG=$(echo "$RESPONSE" | jq -r '.message')
+        echo "Error [$HTTP_CODE]: $ERROR_MSG"
+      else
+        echo "Error [$HTTP_CODE]: Unknown error"
+      fi
+      exit 1
+      ;;
+  esac
 }
 
 # Usage