diff --git a/clickhouse-native-jdbc/src/main/java/com/github/housepower/jdbc/statement/ClickHouseStatement.java b/clickhouse-native-jdbc/src/main/java/com/github/housepower/jdbc/statement/ClickHouseStatement.java
index 2be870d4..5e4d9e65 100644
--- a/clickhouse-native-jdbc/src/main/java/com/github/housepower/jdbc/statement/ClickHouseStatement.java
+++ b/clickhouse-native-jdbc/src/main/java/com/github/housepower/jdbc/statement/ClickHouseStatement.java
@@ -76,8 +76,12 @@ public boolean execute(String query) throws SQLException {
     public int executeUpdate(String query) throws SQLException {
 
         return ExceptionUtil.rethrowSQLException(() -> {
-            cfg.settings().put(SettingKey.max_result_rows, maxRows);
-            cfg.settings().put(SettingKey.result_overflow_mode, "break");
+            // 仅在明确设置了 maxRows > 0 时才配置 settings
+            // 这样 readonly=1 用户可以正常使用（只要不调用 setMaxRows()）
+            if (maxRows > 0) {
+                cfg.settings().put(SettingKey.max_result_rows, maxRows);
+                cfg.settings().put(SettingKey.result_overflow_mode, "break");
+            }
 
             extractDBAndTableName(query);
             Matcher matcher = VALUES_REGEX.matcher(query);