diff --git a/docs-cn/14-reference/03-connector/cpp.mdx b/docs-cn/14-reference/03-connector/cpp.mdx
index 92653955135197a626f2b7c37f0652b4e525ca06..f89adfe6aacce8ee89e5016d5fbb806f0ed71839 100644
--- a/docs-cn/14-reference/03-connector/cpp.mdx
+++ b/docs-cn/14-reference/03-connector/cpp.mdx
@@ -402,39 +402,6 @@ TDengine 的异步 API 均采用非阻塞调用模式。应用程序可以用多
   **支持版本**
    该功能接口从 2.3.0.0 版本开始支持。
 
-  ```c
-  #include <stdlib.h>
-  #include <stdio.h>
-  #include <taos.h>
-
-  int main() {
-    const char* host = "127.0.0.1";
-    const char* user = "root";
-    const char* passwd = "taosdata";
-
-    // connect to server
-    TAOS* taos = taos_connect(host, user, passwd, "test", 0);
-
-    // prepare the line string
-    char* lines1[] = {
-        "stg,t1=3i64,t2=4f64,t3=\"t3\" c1=3i64,c3=L\"passit\",c2=false,c4=4f64 1626006833639000000",
-        "stg,t1=4i64,t3=\"t4\",t2=5f64,t4=5f64 c1=3i64,c3=L\"passitagin\",c2=true,c4=5f64,c5=5f64 1626006833641000000"
-    };
-
-    // schema-less insert
-    TAOS_RES* res = taos_schemaless_insert(taos, lines1, 2, TSDB_SML_LINE_PROTOCOL, TSDB_SML_TIMESTAMP_NANO_SECONDS);
-    if (taos_errno(res) != 0) {
-      printf("failed to insert schema-less data, reason: %s\n", taos_errstr(res));
-    }
-
-    taos_free_result(res);
-
-    // close the connection
-    taos_close(taos);
-    return (code);
-  }
-  ```
-
 ### 订阅和消费 API
 
 订阅 API 目前支持订阅一张或多张表，并通过定期轮询的方式不断获取写入表中的最新数据。