diff --git a/python/kcl_lib/api/service.py b/python/kcl_lib/api/service.py
index 38c8930f..8104f217 100644
--- a/python/kcl_lib/api/service.py
+++ b/python/kcl_lib/api/service.py
@@ -109,7 +109,14 @@ def __init__(self):
             install_kclvm(env_install_path)
             self.lib = ctypes.CDLL(os.path.join(env_install_path, lib_full_name()))
         else:
-            self.lib = ctypes.CDLL(os.path.join(lib_path(), lib_full_name()))
+            # Set the kcl lib and open it.
+            path = lib_path()
+            path_env = os.environ.get("PATH", "")
+            bin_path_str = str(path)
+            new_path_env = f"{path_env}{os.pathsep}{bin_path_str}"
+            os.environ["PATH"] = new_path_env
+            os.environ[KCLVM_CLI_BIN_PATH_ENV_VAR] = bin_path_str
+            self.lib = ctypes.CDLL(os.path.join(path, lib_full_name()))
         # Assuming the shared library exposes a function `kclvm_service_new`
         self.lib.kclvm_service_new.argtypes = [ctypes.c_uint64]
         self.lib.kclvm_service_new.restype = ctypes.c_void_p