diff --git a/lite/example/CMakeLists.txt b/lite/example/CMakeLists.txt
index 9012fded9a2d8bef2b43b0feb07c8d5203628708..229d2d79714d7bcf999a16fefb042d05d9187b33 100644
--- a/lite/example/CMakeLists.txt
+++ b/lite/example/CMakeLists.txt
@@ -1,47 +1,2 @@
-file (GLOB_RECURSE SOURCES ./*.cpp)
-add_executable(lite_examples  ${SOURCES})
-
-if(LITE_BUILD_WITH_RKNPU)
-    #rknn sdk1.0.0 depend on libc++_shared, use gold to remove NEEDED so symbol check
-    target_link_options(lite_examples  PRIVATE "-fuse-ld=gold")
-endif()
-
-target_link_libraries(lite_examples lite_static)
-if(LITE_BUILD_WITH_MGE AND MGE_WITH_ROCM)
-    # FIXME: hip obj can not find cpp obj only through lite_static
-    target_link_libraries(lite_examples megdnn)
-endif()
-
-if(UNIX)
-    if(APPLE OR ANDROID)
-        target_link_libraries(lite_examples dl)
-    else()
-        target_link_libraries(lite_examples dl rt)
-    endif()
-endif()
-
-install (TARGETS lite_examples
-    EXPORT ${LITE_EXPORT_TARGETS}
-    RUNTIME DESTINATION lite/bin)
-
-# add lite_examples_depends_shared for CI check symbol export valid
-add_executable(lite_examples_depends_shared  ${SOURCES})
-
-if(LITE_BUILD_WITH_RKNPU)
-    #rknn sdk1.0.0 depend on libc++_shared, use gold to remove NEEDED so symbol check
-    target_link_options(lite_examples_depends_shared  PRIVATE "-fuse-ld=gold")
-endif()
-
-target_link_libraries(lite_examples_depends_shared lite_shared)
-
-if(UNIX)
-    if(APPLE OR ANDROID)
-        target_link_libraries(lite_examples_depends_shared dl)
-    else()
-        target_link_libraries(lite_examples_depends_shared dl rt)
-    endif()
-endif()
-
-install (TARGETS lite_examples_depends_shared
-    EXPORT ${LITE_EXPORT_TARGETS}
-    RUNTIME DESTINATION lite/bin)
+add_subdirectory(cpp_example)
+add_subdirectory(c_example)
diff --git a/lite/example/c_example/CMakeLists.txt b/lite/example/c_example/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..141725e584026b76ada76bbbf24f27f3c4438afb
--- /dev/null
+++ b/lite/example/c_example/CMakeLists.txt
@@ -0,0 +1,44 @@
+add_executable(lite_c_examples ./main.c)
+if(LITE_BUILD_WITH_RKNPU)
+    #rknn sdk1.0.0 depend on libc++_shared, use gold to remove NEEDED so symbol check
+    target_link_options(lite_c_examples  PRIVATE "-fuse-ld=gold")
+endif()
+target_link_libraries(lite_c_examples lite_static)
+if(LITE_BUILD_WITH_MGE AND MGE_WITH_ROCM)
+    # FIXME: hip obj can not find cpp obj only through lite_static
+    target_link_libraries(lite_c_examples megdnn)
+endif()
+
+if(UNIX)
+    if(APPLE OR ANDROID)
+        target_link_libraries(lite_c_examples dl)
+    else()
+        target_link_libraries(lite_c_examples dl rt)
+    endif()
+endif()
+
+install (TARGETS lite_c_examples
+    EXPORT ${LITE_EXPORT_TARGETS}
+    RUNTIME DESTINATION lite/bin)
+
+# add lite_examples_depends_shared for CI check symbol export valid
+add_executable(lite_c_examples_depends_shared  ./main.c)
+
+if(LITE_BUILD_WITH_RKNPU)
+    #rknn sdk1.0.0 depend on libc++_shared, use gold to remove NEEDED so symbol check
+    target_link_options(lite_c_examples_depends_shared  PRIVATE "-fuse-ld=gold")
+endif()
+
+target_link_libraries(lite_c_examples_depends_shared lite_shared)
+
+if(UNIX)
+    if(APPLE OR ANDROID)
+        target_link_libraries(lite_c_examples_depends_shared dl)
+    else()
+        target_link_libraries(lite_c_examples_depends_shared dl rt)
+    endif()
+endif()
+
+install (TARGETS lite_c_examples_depends_shared
+    EXPORT ${LITE_EXPORT_TARGETS}
+    RUNTIME DESTINATION lite/bin)
diff --git a/lite/example/c_example/main.c b/lite/example/c_example/main.c
new file mode 100644
index 0000000000000000000000000000000000000000..c8a91c7bd22d97ba13e107d238735eb6fccf4048
--- /dev/null
+++ b/lite/example/c_example/main.c
@@ -0,0 +1,89 @@
+/**
+ * \file example/c_example/main.c
+ * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
+ *
+ * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ */
+
+#include "lite-c/global_c.h"
+#include "lite-c/network_c.h"
+#include "lite-c/tensor_c.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#define LITE_CAPI_CHECK(_expr)                                       \
+    do {                                                             \
+        int _ret = (_expr);                                          \
+        if (_ret) {                                                  \
+            fprintf(stderr, "error msg: %s", LITE_get_last_error()); \
+            return -1;                                               \
+        }                                                            \
+    } while (0)
+
+int basic_c_interface(const char* mode_path) {
+    //! create and load the network
+    LiteNetwork c_network;
+    LITE_CAPI_CHECK(
+            LITE_make_network(&c_network, *default_config(), *default_network_io()));
+
+    LITE_CAPI_CHECK(LITE_load_model_from_path(c_network, mode_path));
+
+    //! set input data to input tensor
+    LiteTensor c_input_tensor;
+    LITE_CAPI_CHECK(
+            LITE_get_io_tensor(c_network, "data", LITE_IO, &c_input_tensor));
+    void* dst_ptr;
+    size_t length_in_byte;
+    LITE_CAPI_CHECK(LITE_get_tensor_total_size_in_byte(c_input_tensor,
+                                                       &length_in_byte));
+    LITE_CAPI_CHECK(LITE_get_tensor_memory(c_input_tensor, &dst_ptr));
+    //! copy or forward data to network
+    memset(dst_ptr, 5, length_in_byte);
+
+    //! forward
+    LITE_CAPI_CHECK(LITE_forward(c_network));
+    LITE_CAPI_CHECK(LITE_wait(c_network));
+
+    //! get the output data or read tensor data
+    const char* output_name;
+    LiteTensor c_output_tensor;
+    //! get the first output tensor name
+    LITE_CAPI_CHECK(LITE_get_output_name(c_network, 0, &output_name));
+    LITE_CAPI_CHECK(LITE_get_io_tensor(c_network, output_name, LITE_IO,
+                                       &c_output_tensor));
+    void* output_ptr;
+    size_t length_output_in_byte;
+    LITE_CAPI_CHECK(LITE_get_tensor_memory(c_output_tensor, &output_ptr));
+    LITE_CAPI_CHECK(LITE_get_tensor_total_size_in_byte(c_output_tensor,
+                                                       &length_output_in_byte));
+
+    size_t out_length = length_output_in_byte / sizeof(float);
+    printf("length=%zu\n", out_length);
+
+    float max = -1.0f;
+    float sum = 0.0f;
+    for (size_t i = 0; i < out_length; i++) {
+        float data = ((float*)(output_ptr))[i];
+        sum += data;
+        if (max < data)
+            max = data;
+    }
+    printf("max=%e, sum=%e\n", max, sum);
+    return 0;
+}
+
+int main(int argc, char** argv) {
+    if (argc < 2) {
+        printf("usage: lite_c_examples <model file> , just test C interface "
+               "build.\n");
+        return -1;
+    }
+    return basic_c_interface(argv[1]);
+}
+
+// vim: syntax=cpp.doxygen foldmethod=marker foldmarker=f{{{,f}}}
diff --git a/lite/example/cpp_example/CMakeLists.txt b/lite/example/cpp_example/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9012fded9a2d8bef2b43b0feb07c8d5203628708
--- /dev/null
+++ b/lite/example/cpp_example/CMakeLists.txt
@@ -0,0 +1,47 @@
+file (GLOB_RECURSE SOURCES ./*.cpp)
+add_executable(lite_examples  ${SOURCES})
+
+if(LITE_BUILD_WITH_RKNPU)
+    #rknn sdk1.0.0 depend on libc++_shared, use gold to remove NEEDED so symbol check
+    target_link_options(lite_examples  PRIVATE "-fuse-ld=gold")
+endif()
+
+target_link_libraries(lite_examples lite_static)
+if(LITE_BUILD_WITH_MGE AND MGE_WITH_ROCM)
+    # FIXME: hip obj can not find cpp obj only through lite_static
+    target_link_libraries(lite_examples megdnn)
+endif()
+
+if(UNIX)
+    if(APPLE OR ANDROID)
+        target_link_libraries(lite_examples dl)
+    else()
+        target_link_libraries(lite_examples dl rt)
+    endif()
+endif()
+
+install (TARGETS lite_examples
+    EXPORT ${LITE_EXPORT_TARGETS}
+    RUNTIME DESTINATION lite/bin)
+
+# add lite_examples_depends_shared for CI check symbol export valid
+add_executable(lite_examples_depends_shared  ${SOURCES})
+
+if(LITE_BUILD_WITH_RKNPU)
+    #rknn sdk1.0.0 depend on libc++_shared, use gold to remove NEEDED so symbol check
+    target_link_options(lite_examples_depends_shared  PRIVATE "-fuse-ld=gold")
+endif()
+
+target_link_libraries(lite_examples_depends_shared lite_shared)
+
+if(UNIX)
+    if(APPLE OR ANDROID)
+        target_link_libraries(lite_examples_depends_shared dl)
+    else()
+        target_link_libraries(lite_examples_depends_shared dl rt)
+    endif()
+endif()
+
+install (TARGETS lite_examples_depends_shared
+    EXPORT ${LITE_EXPORT_TARGETS}
+    RUNTIME DESTINATION lite/bin)
diff --git a/lite/example/example.h b/lite/example/cpp_example/example.h
similarity index 98%
rename from lite/example/example.h
rename to lite/example/cpp_example/example.h
index eaec211de50756ed5c0e377cd14a086aafc1840b..37c12b9e3d062d59350363368df29a6abeabef9f 100644
--- a/lite/example/example.h
+++ b/lite/example/cpp_example/example.h
@@ -1,5 +1,5 @@
 /**
- * \file example/example.cpp
+ * \file example/cpp_example/example.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/main.cpp b/lite/example/cpp_example/main.cpp
similarity index 97%
rename from lite/example/main.cpp
rename to lite/example/cpp_example/main.cpp
index ca03caf41d2abd53bec236c7710eeac3511c28ce..2f93e8faf603c2e1776ceea5ab13d7d0cadd6921 100644
--- a/lite/example/main.cpp
+++ b/lite/example/cpp_example/main.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/example.cpp
+ * \file example/cpp_example/cpp_example/example.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
@@ -133,7 +133,11 @@ int main(int argc, char** argv) {
     auto example = (*map)[args.example_name];
     if (example) {
         printf("Begin to run %s example.\n", args.example_name.c_str());
-        return example(args);
+        if (example(args)) {
+            return 0;
+        } else {
+            return -1;
+        }
     } else {
         printf("The example of %s is not registed.", args.example_name.c_str());
         return -1;
diff --git a/lite/example/mge/README.md b/lite/example/cpp_example/mge/README.md
similarity index 100%
rename from lite/example/mge/README.md
rename to lite/example/cpp_example/mge/README.md
diff --git a/lite/example/mge/basic.cpp b/lite/example/cpp_example/mge/basic.cpp
similarity index 99%
rename from lite/example/mge/basic.cpp
rename to lite/example/cpp_example/mge/basic.cpp
index 7300e09a857d2c122df337777b8559cff601c29f..bcde2f51e5708f04ed51e4ca737cea22f2c5fbf8 100644
--- a/lite/example/mge/basic.cpp
+++ b/lite/example/cpp_example/mge/basic.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/basic.cpp
+ * \file example/cpp_example/basic.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/mge/cpu_affinity.cpp b/lite/example/cpp_example/mge/cpu_affinity.cpp
similarity index 98%
rename from lite/example/mge/cpu_affinity.cpp
rename to lite/example/cpp_example/mge/cpu_affinity.cpp
index 508910d4eb24288492ec492db3fc90f65df7b2c2..a112100470af398ca8fdd2f14431f74bfed44f4c 100644
--- a/lite/example/mge/cpu_affinity.cpp
+++ b/lite/example/cpp_example/mge/cpu_affinity.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/cpu_affinity.cpp
+ * \file example/cpp_example/cpu_affinity.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/mge/device_io.cpp b/lite/example/cpp_example/mge/device_io.cpp
similarity index 99%
rename from lite/example/mge/device_io.cpp
rename to lite/example/cpp_example/mge/device_io.cpp
index 3aee29490e2c4e2ad004f62813d6c6f19f370bb9..fa5c568373b3afd14f40c813b2616658dafcf98e 100644
--- a/lite/example/mge/device_io.cpp
+++ b/lite/example/cpp_example/mge/device_io.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/device_io.cpp
+ * \file example/cpp_example/device_io.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/mge/lite_c_interface.cpp b/lite/example/cpp_example/mge/lite_c_interface.cpp
similarity index 99%
rename from lite/example/mge/lite_c_interface.cpp
rename to lite/example/cpp_example/mge/lite_c_interface.cpp
index c967948025de88bcb4e314a73f40ccb83118d63a..2696a1caafe75c4cdb96a4871d9ad03d2dfc5a63 100644
--- a/lite/example/mge/lite_c_interface.cpp
+++ b/lite/example/cpp_example/mge/lite_c_interface.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/basic_c_interface.cpp
+ * \file example/cpp_example/basic_c_interface.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/mge/network_share_weights.cpp b/lite/example/cpp_example/mge/network_share_weights.cpp
similarity index 98%
rename from lite/example/mge/network_share_weights.cpp
rename to lite/example/cpp_example/mge/network_share_weights.cpp
index 818f09d8aba741128d2d21c394e6c556431b9bb6..61b9cb36426c3fb89c96e2d60e9e6f131fdf45ae 100644
--- a/lite/example/mge/network_share_weights.cpp
+++ b/lite/example/cpp_example/mge/network_share_weights.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/network_share_weights.cpp
+ * \file example/cpp_example/network_share_weights.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/mge/reset_io.cpp b/lite/example/cpp_example/mge/reset_io.cpp
similarity index 98%
rename from lite/example/mge/reset_io.cpp
rename to lite/example/cpp_example/mge/reset_io.cpp
index 1a8143b30780a61efb0dd8c7710400bfcbc2c72e..5d21526b02aded2e7ac2fcec472c20eafec023e6 100644
--- a/lite/example/mge/reset_io.cpp
+++ b/lite/example/cpp_example/mge/reset_io.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/reset_io.cpp
+ * \file example/cpp_example/reset_io.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/mge/user_allocator.cpp b/lite/example/cpp_example/mge/user_allocator.cpp
similarity index 98%
rename from lite/example/mge/user_allocator.cpp
rename to lite/example/cpp_example/mge/user_allocator.cpp
index a0f78f259cbf1e7a80346454a04a711959eb424b..73b9b41df1756bf640d9cd1b94925009fa162aec 100644
--- a/lite/example/mge/user_allocator.cpp
+++ b/lite/example/cpp_example/mge/user_allocator.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/user_allocator.cpp
+ * \file example/cpp_example/user_allocator.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/mge/user_cryption.cpp b/lite/example/cpp_example/mge/user_cryption.cpp
similarity index 98%
rename from lite/example/mge/user_cryption.cpp
rename to lite/example/cpp_example/mge/user_cryption.cpp
index 88496090d1b1356eedfba2c596cfec721b77cbe3..ef7e8c6de66f72f52327aebdc6582db7cd5b3bce 100644
--- a/lite/example/mge/user_cryption.cpp
+++ b/lite/example/cpp_example/mge/user_cryption.cpp
@@ -1,5 +1,5 @@
 /**
- * \file example/user_cryption.cpp
+ * \file example/cpp_example/user_cryption.cpp
  * MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
  *
  * Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
diff --git a/lite/example/npy.h b/lite/example/cpp_example/npy.h
similarity index 100%
rename from lite/example/npy.h
rename to lite/example/cpp_example/npy.h
diff --git a/lite/include/lite/common_enum_c.h b/lite/include/lite/common_enum_c.h
index 361b52d2b250a410f2868a78aec401a17d93247b..f9b7a3a73e65ff6315d19b34aca11ac900ce772f 100644
--- a/lite/include/lite/common_enum_c.h
+++ b/lite/include/lite/common_enum_c.h
@@ -15,18 +15,18 @@
 /*!
  * \brief The log level.
  */
-typedef enum LiteLogLevel {
+typedef enum {
     DEBUG = 0, /*!< The lowest level and most verbose */
     INFO = 1,  /*!< The lowest level and most verbose */
     WARN = 2,  /*!< Print only warning and errors */
     ERROR = 3, /*!< Print only errors */
 } LiteLogLevel;
 
-typedef enum LiteBackend {
+typedef enum {
     LITE_DEFAULT = 0, //! default backend is mge
 } LiteBackend;
 
-typedef enum LiteDeviceType {
+typedef enum {
     LITE_CPU = 0,
     LITE_CUDA = 1,
     LITE_ATLAS = 3,
@@ -36,7 +36,7 @@ typedef enum LiteDeviceType {
     LITE_DEVICE_DEFAULT = 5,
 } LiteDeviceType;
 
-typedef enum LiteDataType {
+typedef enum {
     LITE_FLOAT = 0,
     LITE_HALF = 1,
     LITE_INT = 2,
@@ -46,9 +46,9 @@ typedef enum LiteDataType {
     LITE_UINT = 6,
     LITE_UINT16 = 7,
     LITE_INT64 = 8,
-} LiteCDataType;
+} LiteDataType;
 
-typedef enum LiteTensorPhase {
+typedef enum {
     //! Tensor maybe input or output
     LITE_IO = 0,
     //! Tensor is input
@@ -61,7 +61,7 @@ typedef enum LiteTensorPhase {
  * \brief the input and output type, include SHAPE and VALUE
  * sometimes user only need the shape of the output tensor
  */
-typedef enum LiteIOType {
+typedef enum {
     LITE_IO_VALUE = 0,
     LITE_IO_SHAPE = 1,
 } LiteIOType;
@@ -88,7 +88,7 @@ typedef enum LiteIOType {
  * 5. LITE_ALGO_PROFILE | LITE_ALGO_OPTIMIZED | LITE_ALGO_REPRODUCIBLE means:
  * profile the best algorithm form the optimzed and reproducible algorithms
  */
-typedef enum LiteAlgoSelectStrategy {
+typedef enum {
     LITE_ALGO_HEURISTIC = 1 << 0,
     LITE_ALGO_PROFILE = 1 << 1,
     LITE_ALGO_REPRODUCIBLE = 1 << 2,