diff --git a/internal/core/src/segcore/TokenizerCTest.cpp b/internal/core/src/segcore/TokenizerCTest.cpp
index 2722538492..a3934795c3 100644
--- a/internal/core/src/segcore/TokenizerCTest.cpp
+++ b/internal/core/src/segcore/TokenizerCTest.cpp
@@ -16,7 +16,6 @@
 #include "pb/schema.pb.h"
 #include "segcore/token_stream_c.h"
 #include "segcore/tokenizer_c.h"
-#include "segcore/map_c.h"
 
 using Map = std::map<std::string, std::string>;
 
@@ -42,11 +41,6 @@ TEST(ValidateTextSchema, JieBa) {
     ASSERT_EQ(milvus::ErrorCode::Success, status.error_code);
 }
 
-void
-set_cmap(CMap m, const std::string& key, const std::string& value) {
-    cmap_set(m, key.c_str(), key.length(), value.c_str(), value.length());
-}
-
 TEST(CTokenizer, Default) {
     auto analyzer_params = R"({"tokenizer": "standard"})";
     CTokenizer tokenizer;
diff --git a/internal/core/src/segcore/map_c.cpp b/internal/core/src/segcore/map_c.cpp
deleted file mode 100644
index e0a21f1c38..0000000000
--- a/internal/core/src/segcore/map_c.cpp
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright (C) 2019-2020 Zilliz. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software distributed under the License
-// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
-// or implied. See the License for the specific language governing permissions and limitations under the License
-
-#include "segcore/map_c.h"
-
-#include <memory>
-#include <map>
-#include <string>
-
-using Map = std::map<std::string, std::string>;
-
-CMap
-create_cmap() {
-    auto m = std::make_unique<Map>();
-    return m.release();
-}
-
-void
-free_cmap(CMap m) {
-    delete static_cast<Map*>(m);
-}
-
-void
-cmap_set(CMap m,
-         const char* key,
-         uint32_t key_len,
-         const char* value,
-         uint32_t value_len) {
-    auto mm = static_cast<Map*>(m);
-    (*mm)[std::string(key, key_len)] = std::string(value, value_len);
-}
diff --git a/internal/core/src/segcore/map_c.h b/internal/core/src/segcore/map_c.h
deleted file mode 100644
index 74a6f10f05..0000000000
--- a/internal/core/src/segcore/map_c.h
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright (C) 2019-2020 Zilliz. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
-// with the License. You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software distributed under the License
-// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
-// or implied. See the License for the specific language governing permissions and limitations under the License
-
-#pragma once
-
-#include <stdint.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef void* CMap;
-
-CMap
-create_cmap();
-
-void
-free_cmap(CMap m);
-
-void
-cmap_set(CMap m,
-         const char* key,
-         uint32_t key_len,
-         const char* value,
-         uint32_t value_len);
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/internal/core/src/segcore/token_stream_c.h b/internal/core/src/segcore/token_stream_c.h
index c19ae87113..06f634905d 100644
--- a/internal/core/src/segcore/token_stream_c.h
+++ b/internal/core/src/segcore/token_stream_c.h
@@ -13,7 +13,6 @@
 
 #include <stdint.h>
 
-#include "map_c.h"
 #include "common/type_c.h"
 
 #ifdef __cplusplus
diff --git a/internal/core/src/segcore/tokenizer_c.h b/internal/core/src/segcore/tokenizer_c.h
index 8b13cdb41e..d803c8e533 100644
--- a/internal/core/src/segcore/tokenizer_c.h
+++ b/internal/core/src/segcore/tokenizer_c.h
@@ -13,7 +13,6 @@
 
 #include <stdint.h>
 
-#include "segcore/map_c.h"
 #include "segcore/token_stream_c.h"
 #include "common/type_c.h"
 
diff --git a/internal/util/analyzer/canalyzer/c_map.go b/internal/util/analyzer/canalyzer/c_map.go
deleted file mode 100644
index f7a364f780..0000000000
--- a/internal/util/analyzer/canalyzer/c_map.go
+++ /dev/null
@@ -1,45 +0,0 @@
-package canalyzer
-
-/*
-#cgo pkg-config: milvus_core
-#include <stdlib.h>	// free
-#include "segcore/map_c.h"
-*/
-import "C"
-import "unsafe"
-
-type CMap struct {
-	ptr C.CMap
-}
-
-func NewCMap() *CMap {
-	return &CMap{
-		ptr: C.create_cmap(),
-	}
-}
-
-func (m *CMap) GetPointer() C.CMap {
-	return m.ptr
-}
-
-func (m *CMap) Set(key string, value string) {
-	cKey := C.CString(key)
-	defer C.free(unsafe.Pointer(cKey))
-
-	cValue := C.CString(value)
-	defer C.free(unsafe.Pointer(cValue))
-
-	C.cmap_set(m.ptr, cKey, (C.uint32_t)(len(key)), cValue, (C.uint32_t)(len(value)))
-}
-
-func (m *CMap) From(gm map[string]string) {
-	for k, v := range gm {
-		m.Set(k, v)
-	}
-}
-
-func (m *CMap) Destroy() {
-	if m.ptr != nil {
-		C.free_cmap(m.ptr)
-	}
-}