diff --git a/kclvm/api/src/lib.rs b/kclvm/api/src/lib.rs
index 9b94de4e1..a0beefa54 100644
--- a/kclvm/api/src/lib.rs
+++ b/kclvm/api/src/lib.rs
@@ -1,8 +1,72 @@
-pub mod service;
-
+//! # KCL Rust SDK
+//!
+//! ## How to Use
+//!
+//! ```no_check,no_run
+//! cargo add --git https://github.com/kcl-lang/kcl kclvm_api
+//! ```
+//!
+//! Write the Code
+//!
+//! ```no_run
+//! use kclvm_api::*;
+//! use std::path::Path;
+//! use anyhow::Result;
+//!
+//! fn main() -> Result<()> {
+//!     let api = API::default();
+//!     let args = &ExecProgramArgs {
+//!         work_dir: Path::new(".").join("testdata").canonicalize().unwrap().display().to_string(),
+//!         k_filename_list: vec!["test.k".to_string()],
+//!         ..Default::default()
+//!     };
+//!     let exec_result = api.exec_program(args)?;
+//!     assert_eq!(exec_result.yaml_result, "alice:\n  age: 18");
+//!     Ok(())
+//! }
+//! ```
 #[cfg(test)]
 pub mod capi_test;
+pub mod service;
 
 pub mod gpyrpc {
     include!(concat!(env!("OUT_DIR"), "/gpyrpc.rs"));
 }
+
+pub use crate::gpyrpc::*;
+use crate::service::capi::{kclvm_service_call_with_length, kclvm_service_new};
+use crate::service::service_impl::KclvmServiceImpl;
+use anyhow::Result;
+use std::ffi::CString;
+
+pub type API = KclvmServiceImpl;
+
+/// Call KCL API with the API name and argument protobuf bytes.
+#[inline]
+pub fn call<'a>(name: &'a [u8], args: &'a [u8]) -> Result<Vec<u8>> {
+    call_with_plugin_agent(name, args, 0)
+}
+
+/// Call KCL API with the API name, argument protobuf bytes and the plugin agent pointer address.
+pub fn call_with_plugin_agent<'a>(
+    name: &'a [u8],
+    args: &'a [u8],
+    plugin_agent: u64,
+) -> Result<Vec<u8>> {
+    let mut result_len: usize = 0;
+    let result_ptr = {
+        let args = CString::new(args)?;
+        let call = CString::new(name)?;
+        let serv = kclvm_service_new(plugin_agent);
+        kclvm_service_call_with_length(serv, call.as_ptr(), args.as_ptr(), &mut result_len)
+    };
+    let result = unsafe {
+        let mut dest_data: Vec<u8> = Vec::with_capacity(result_len);
+        let dest_ptr: *mut u8 = dest_data.as_mut_ptr();
+        std::ptr::copy_nonoverlapping(result_ptr as *const u8, dest_ptr, result_len);
+        dest_data.set_len(result_len);
+        dest_data
+    };
+
+    Ok(result)
+}