diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..8d10409
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Bubgit
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..03335ba
--- /dev/null
+++ b/README.md
@@ -0,0 +1,35 @@
+### Quick use:
+```golang
+
+import Err "github.com/InkAndHumour/err"
+
+func foo() Err.Err {
+    err := ……
+    if err != nil {
+        return Err.New().Err(
+            "……",err,
+        )
+    }
+    
+    return nil
+}
+
+```
+
+### if you wangt to return the default error:
+```golang
+
+import Err "github.com/InkAndHumour/err"
+
+func foo() error {
+    err := ……
+    if err != nil {
+        return Err.New().Err(
+            "……",err,
+        )
+    }
+
+    return nil
+}
+
+```
\ No newline at end of file
diff --git a/code.go b/code.go
new file mode 100644
index 0000000..670058e
--- /dev/null
+++ b/code.go
@@ -0,0 +1,25 @@
+package err
+
+type code uint32
+
+const (
+	// 创建资源失败
+	CodeCreateFialed code = 1001001
+	// 记录不存在
+	CodeItemNotFound code = 1001002
+	// 更新记录失败
+	CodeUpdateFialed code = 1001003
+	// 删除记录失败
+	CodeDeleteFialed code = 1001004
+
+	// 记录已过期
+	CodeItemExpired code = 2001001
+
+	// 资源繁忙
+	CodeIsBusy code = 3001001
+)
+
+func (e *errs) Code(code uint32) Err {
+	e.code = code
+	return e
+}
diff --git a/err.go b/err.go
new file mode 100644
index 0000000..0138309
--- /dev/null
+++ b/err.go
@@ -0,0 +1,160 @@
+package err
+
+import (
+	"fmt"
+)
+
+const (
+	// "incorrect params value" 参数值错误
+	ERR_PARAMS = "incorrect params value"
+	// "lack of necessary parameters" 必填参数不可为空
+	ERR_NECESSARY_PARAMS = "lack of necessary parameters"
+	// "item info not exist" 记录信息不存在
+	ERR_ITEM_NOT_EXIST = "item info not exist"
+	// "effect rows is 0" 操作影响数为 0
+	ERR_EFFECT_ROWS_0 = "effect rows is 0"
+
+	// 请勿重复请求
+	ERR_LIMIT_DUPLICATED_CODE = 10001
+	ERR_LIMIT_DUPLICATED_ZN   = "请勿重复请求"
+	// 请求去重校验失败
+	ERR_LIMIT_DUPLICATION_FAILED_CODE = 10002
+	ERR_LIMIT_DUPLICATION_FAILED_ZN   = "请求去重校验失败"
+
+	// 参数有误，请检查
+	ERR_INVALIDED_PARAMS_CODE = 10010
+	ERR_INVALIDED_PARAMS_ZN   = "参数有误，请检查"
+	// 记录已存在
+	ERR_ALREADY_EXIST_CODE = 10011
+	ERR_ALREADY_EXIST_ZN   = "记录已存在"
+
+	// 用户名或密码错误
+	ERR_INVALIDED_USERNAME_PASSWORD_CODE = 10020
+	ERR_INVALIDED_USERNAME_PASSWORD_ZN   = "用户名或密码错误"
+	// Token 无效
+	ERR_INVALIDED_TOKEN_CODE = 10021
+	ERR_INVALIDED_TOKEN_ZN   = "Token 无效"
+	// "仅支持系统管理员"
+	ERR_ONLY_FOR_ADMIN_CODE = 10022
+	ERR_ONLY_FOR_ADMIN_ZN   = "仅支持系统管理员"
+
+	// 内部系统错误
+	ERR_SYS_BUSY_CODE  = 50001
+	ERR_SYS_BUSY_ZN    = "系统繁忙请稍后"
+	ERR_SYS_INNER_CODE = 50010
+	ERR_SYS_INNER_ZN   = "服务异常，请稍后"
+)
+
+type Err interface {
+	// set or add error for debug
+	Err(cue string, detail ...interface{}) Err
+	// attach string: faield, to explain the call path
+	Failed(cue string) Err
+	// set or add context value for debug
+	Info(cue string, detail ...interface{}) Err
+	// set or add error code for front
+	Code(code uint32) Err
+	// set or add cue msg  for front
+	Msg(msg string) Err
+	// return full error detail for debug
+	Detail() error
+	GetMsg() string
+	GetCode() string
+	GetCodeUint32() uint32
+	GetCodeInt32() int32
+
+	Error() string
+}
+
+func New() Err {
+	return &errs{}
+}
+
+type errs struct {
+	err  error
+	code uint32
+	msg  string
+}
+
+func (e *errs) Error() string {
+	return fmt.Sprintf("{\"err\":\"%+v\",\"msg\":\"%v\",\"code\":\"%v\"}", e.err, e.msg, e.code)
+}
+func (e *errs) GetMsg() string {
+	return fmt.Sprintf("%v", e.msg)
+}
+
+func (e *errs) GetCode() string {
+	return fmt.Sprintf("%v", e.code)
+}
+func (e *errs) GetCodeUint32() uint32 {
+	return e.code
+}
+func (e *errs) GetCodeInt32() int32 {
+	return int32(e.code)
+}
+
+func (e *errs) Detail() error {
+	return fmt.Errorf("{\"err\":\"%+v\",\"msg\":\"%v\",\"code\":\"%v\"}", e.err, e.msg, e.code)
+}
+
+func (e *errs) Err(cue string, detail ...interface{}) Err {
+	if e.err != nil {
+		return e.add(cue, detail...)
+	}
+	return e.set(cue, detail...)
+}
+
+func (e *errs) Failed(cue string) Err {
+	return e.Err(fmt.Sprintf("%v failed", cue))
+}
+
+func (e *errs) set(cue string, detail ...interface{}) *errs {
+	if len(detail) == 0 {
+		return e.setSolo(cue)
+	}
+	return e.setMulti(cue, detail[0])
+}
+
+func (e *errs) setSolo(cue string) *errs {
+	e.err = fmt.Errorf("%v;", cue)
+	return e
+}
+
+func (e *errs) setMulti(cue string, detail interface{}) *errs {
+	e.err = fmt.Errorf("%v err: %v;", cue, detail)
+	return e
+}
+
+func (e *errs) add(cue string, detail ...interface{}) *errs {
+	if len(detail) == 0 {
+		return e.addSolo(cue)
+	}
+	return e.addMulti(cue, detail[0])
+}
+
+func (e *errs) addSolo(cue string) *errs {
+	e.err = fmt.Errorf("%v; %v", cue, e.err)
+	return e
+}
+
+func (e *errs) addMulti(cue string, detail interface{}) *errs {
+	e.err = fmt.Errorf(" %v err: %+v; %v ", cue, detail, e.err)
+	return e
+}
+
+func (e *errs) Info(cue string, detail ...interface{}) Err {
+	if e.err != nil {
+		return e.addInfo(cue, detail)
+	}
+	return e.setInfo(cue, detail)
+}
+
+func (e *errs) setInfo(cue string, detail interface{}) *errs {
+	e.err = fmt.Errorf("%v: %+v;", cue, detail)
+	return e
+}
+
+func (e *errs) addInfo(cue string, detail interface{}) *errs {
+	e.err = fmt.Errorf("%v %v: %+v;", e.err, cue, detail)
+	return e
+}
diff --git a/err_test.go b/err_test.go
new file mode 100644
index 0000000..eb35868
--- /dev/null
+++ b/err_test.go
@@ -0,0 +1,19 @@
+package err
+
+import "testing"
+
+func TestErr(t *testing.T) {
+	// err := &errs{}
+
+	// err.Err("c1", "e1")
+	// t.Log("setSolo:", err.Detail())
+
+	// err.Err("c2", "e2")
+	// t.Log("setSolo:", err.Detail())
+
+	// err.Err("c3", "e3")
+	// t.Log("setSolo:", err.Detail())
+
+	err := New()
+	t.Log("err.GetCode():", err.GetCode())
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2f1ecdc
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/hny/err
+
+go 1.21.4
diff --git a/msg.go b/msg.go
new file mode 100644
index 0000000..05daf8c
--- /dev/null
+++ b/msg.go
@@ -0,0 +1,20 @@
+package err
+
+import "fmt"
+
+func (e *errs) Msg(msg string) Err {
+	if e.msg == "" {
+		return e.setMsg(msg)
+	}
+	return e.addMsg(msg)
+}
+
+func (e *errs) setMsg(msg string) *errs {
+	e.msg = msg
+	return e
+}
+
+func (e *errs) addMsg(msg string) *errs {
+	e.msg = fmt.Sprintf("%s; %s", e.msg, msg)
+	return e
+}