diff --git a/GoMybatis.go b/GoMybatis.go
index 79303c8..af02891 100644
--- a/GoMybatis.go
+++ b/GoMybatis.go
@@ -10,30 +10,60 @@ import (
 //如果使用WriteMapperByEngine()，则内建默认的SessionFactory
 var DefaultSessionFactory *SessionFactory
 
-//根据sessionEngine写入到mapperPtr
-func WriteMapperByEngine(value reflect.Value, xml []byte, sessionEngine *SessionEngine, enableLog bool) {
+var DefaultExpressionTypeConvert ExpressionTypeConvert
+
+var DefaultSqlArgTypeConvert SqlArgTypeConvert
+
+var DefaultExpressionEngine ExpressionEngine
+
+var DefaultSqlBuilder SqlBuilder
+
+var DefaultSqlResultDecoder SqlResultDecoder
+
+var DefaultLog Log
+
+//推荐默认使用单例传入
+//根据sessionEngine写入到mapperPtr，value:指向mapper指针反射对象，xml：xml数据，sessionEngine：session引擎，enableLog:是否允许日志输出，log：日志实现
+func WriteMapperByEngine(value reflect.Value, xml []byte, sessionEngine *SessionEngine, enableLog bool, log Log) {
 	if value.Kind() != reflect.Ptr {
 		panic("UseMapper: UseMapper arg must be a pointer")
 	}
-	var factory = SessionFactory{}.New(sessionEngine)
 	if DefaultSessionFactory == nil {
+		var factory = SessionFactory{}.New(sessionEngine)
 		DefaultSessionFactory = &factory
 	}
-	var expressConvert=GoMybatisExpressionTypeConvert{}
-	var sqlConvert=GoMybatisSqlArgTypeConvert{}
-	var expressionEngine = ExpressionEngineProxy{}.New(&ExpressionEngineExpr{},true)
-	var sqlBuilder=GoMybatisSqlBuilder{}.New(expressConvert,sqlConvert, expressionEngine,&LogStandard{},enableLog)
-	var decoder = GoMybatisSqlResultDecoder{}
-	WriteMapper(value, xml, DefaultSessionFactory, decoder,sqlBuilder,enableLog)
+	if DefaultExpressionTypeConvert == nil {
+		DefaultExpressionTypeConvert = GoMybatisExpressionTypeConvert{}
+	}
+	if DefaultSqlArgTypeConvert == nil {
+		DefaultSqlArgTypeConvert = GoMybatisSqlArgTypeConvert{}
+	}
+	if DefaultExpressionEngine == nil {
+		DefaultExpressionEngine = &ExpressionEngineExpr{}
+	}
+	var expressionEngineProxy = ExpressionEngineProxy{}.New(DefaultExpressionEngine, true)
+	if log == nil {
+		DefaultLog = &LogStandard{}
+	} else {
+		DefaultLog = log
+	}
+	if DefaultSqlBuilder == nil {
+		DefaultSqlBuilder = GoMybatisSqlBuilder{}.New(DefaultExpressionTypeConvert, DefaultSqlArgTypeConvert, expressionEngineProxy, DefaultLog, enableLog)
+	}
+	if DefaultSqlResultDecoder == nil {
+		DefaultSqlResultDecoder = GoMybatisSqlResultDecoder{}
+	}
+	WriteMapper(value, xml, DefaultSessionFactory, DefaultSqlResultDecoder, DefaultSqlBuilder, enableLog)
 }
 
-//根据sessionEngine写入到mapperPtr
-func WriteMapperPtrByEngine(ptr interface{}, xml []byte, sessionEngine *SessionEngine, enableLog bool) {
+//推荐默认使用单例传入
+//根据sessionEngine写入到mapperPtr，ptr:指向mapper指针，xml：xml数据，sessionEngine：session引擎，enableLog:是否允许日志输出，log：日志实现
+func WriteMapperPtrByEngine(ptr interface{}, xml []byte, sessionEngine *SessionEngine, enableLog bool, log Log) {
 	v := reflect.ValueOf(ptr)
 	if v.Kind() != reflect.Ptr {
 		panic("UseMapper: UseMapper arg must be a pointer")
 	}
-	WriteMapperByEngine(v, xml, sessionEngine, enableLog)
+	WriteMapperByEngine(v, xml, sessionEngine, enableLog, log)
 }
 
 //写入方法内容，例如
@@ -48,7 +78,7 @@ func WriteMapperPtrByEngine(ptr interface{}, xml []byte, sessionEngine *SessionE
 //func的结构体参数无需指定mapperParams的tag，框架会自动扫描它的属性，封装为map处理掉
 //使用WriteMapper函数设置代理后即可正常使用。
 func WriteMapper(bean reflect.Value, xml []byte, sessionFactory *SessionFactory, decoder SqlResultDecoder, sqlBuilder SqlBuilder, enableLog bool) {
-	beanCheck(bean,sqlBuilder)
+	beanCheck(bean, sqlBuilder)
 	var mapperTree = LoadMapperXml(xml)
 	//make a map[method]xml
 	var methodXmlMap = makeMethodXmlMap(bean, mapperTree)
@@ -91,7 +121,7 @@ func WriteMapper(bean reflect.Value, xml []byte, sessionFactory *SessionFactory,
 }
 
 //check beans
-func beanCheck(value reflect.Value,builder SqlBuilder) {
+func beanCheck(value reflect.Value, builder SqlBuilder) {
 	var t = value.Type()
 	if t.Kind() == reflect.Ptr {
 		t = t.Elem()
@@ -105,7 +135,7 @@ func beanCheck(value reflect.Value,builder SqlBuilder) {
 		var customLen = 0
 		for argIndex := 0; argIndex < fieldItem.Type.NumIn(); argIndex++ {
 			var inType = fieldItem.Type.In(argIndex)
-			if builder.ExpressionEngineProxy().Name()=="ExpressionEngineGovaluate" && inType.Kind() == reflect.Ptr && inType.String() != GoMybatis_Session_Ptr {
+			if builder.ExpressionEngineProxy().Name() == "ExpressionEngineGovaluate" && inType.Kind() == reflect.Ptr && inType.String() != GoMybatis_Session_Ptr {
 				panic(`[GoMybats] ` + fieldItem.Name + `() arg = ` + inType.String() + ` can not be a ptr ! must delete '*'!`)
 			}
 			if isCustomStruct(inType) {
diff --git a/GoMybatisEngine_test.go b/GoMybatisEngine_test.go
index fefe76c..f13367e 100644
--- a/GoMybatisEngine_test.go
+++ b/GoMybatisEngine_test.go
@@ -206,6 +206,6 @@ func InitMapperByLocalSession() ExampleActivityMapperImpl {
     </select>`)
 	var exampleActivityMapperImpl ExampleActivityMapperImpl
 	//设置对应的mapper xml文件,禁止输出日志
-	WriteMapperPtrByEngine(&exampleActivityMapperImpl, bytes, engine, false)
+	WriteMapperPtrByEngine(&exampleActivityMapperImpl, bytes, engine, false,nil)
 	return exampleActivityMapperImpl
 }
diff --git a/Log.go b/Log.go
index 7fbc82f..4a1d890 100644
--- a/Log.go
+++ b/Log.go
@@ -1,5 +1,6 @@
 package GoMybatis
 
 type Log interface {
-	Println(messages []byte)
+	QueueLen() int//日志消息队列长度
+	Println(messages []byte)//日志输出方法实现
 }
diff --git a/LogStandard.go b/LogStandard.go
index 6be9e23..da77ffa 100644
--- a/LogStandard.go
+++ b/LogStandard.go
@@ -3,9 +3,15 @@ package GoMybatis
 import "log"
 
 type LogStandard struct {
-	PrintlnFunc func(v []byte)
+	PrintlnFunc func(messages []byte)//日志输出方法实现
 }
 
+//日志消息队列长度
+func (this *LogStandard) QueueLen() int {
+	//默认50万个日志消息缓存队列
+	return 500000
+}
+//日志输出方法实现
 func (this *LogStandard) Println(v []byte) {
 	if this.PrintlnFunc != nil {
 		this.PrintlnFunc(v)
diff --git a/LogSystem.go b/LogSystem.go
index 19161fb..4a896fc 100644
--- a/LogSystem.go
+++ b/LogSystem.go
@@ -3,25 +3,16 @@ package GoMybatis
 import (
 	"bytes"
 	"github.com/zhuxiujia/GoMybatis/utils"
-	"time"
-)
-
-type LogMode int
-
-const (
-	Log_Mode_async     LogMode = iota //异步，非实时
-	Log_Mode_Real_Time                //同步,实时
 )
 
 type LogSystem struct {
 	log     Log
 	logChan chan []byte
 	started bool
-	mode    LogMode
 }
 
 //logImpl:日志实现类,queueLen:消息队列缓冲长度
-func (this LogSystem) New(logImpl Log, queueLen int, mode LogMode) (LogSystem, error) {
+func (this LogSystem) New(logImpl Log, queueLen int) (LogSystem, error) {
 	if this.started == true {
 		return this, utils.NewError("LogSystem", "log system is started!")
 	}
@@ -30,8 +21,6 @@ func (this LogSystem) New(logImpl Log, queueLen int, mode LogMode) (LogSystem, e
 	}
 	this.logChan = make(chan []byte, queueLen)
 	this.log = logImpl
-	this.mode = mode
-
 	//启动接受者
 	go this.receiver()
 	this.started = true
@@ -61,12 +50,6 @@ func (this *LogSystem) SendLog(logs ...string) error {
 //日志接受者
 func (this *LogSystem) receiver() error {
 	for {
-		if this.mode == Log_Mode_async {
-			//非实时，加延迟，出让cpu时间片，否则日志占用cpu过多将拖慢系统
-			time.Sleep(50 * time.Millisecond)
-		} else if this.mode == Log_Mode_Real_Time {
-			//实时，直接执行操作
-		}
 		logs := <-this.logChan
 		this.log.Println(logs)
 	}
diff --git a/LogSystem_test.go b/LogSystem_test.go
index 753015d..c6e59fe 100644
--- a/LogSystem_test.go
+++ b/LogSystem_test.go
@@ -14,7 +14,7 @@ func TestLogSystem_SendLog(t *testing.T) {
 			endChan <- 1
 		},
 	}
-	var system, err = LogSystem{}.New(&stdLog, 1000000, Log_Mode_async)
+	var system, err = LogSystem{}.New(&stdLog, 1000000)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -35,7 +35,7 @@ func TestLogSystem_Close(t *testing.T) {
 			endChan <- 1
 		},
 	}
-	var system, err = LogSystem{}.New(&stdLog, 1000000, Log_Mode_async)
+	var system, err = LogSystem{}.New(&stdLog, 1000000)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/SqlBuilder.go b/SqlBuilder.go
index 3171f5c..4a0118e 100644
--- a/SqlBuilder.go
+++ b/SqlBuilder.go
@@ -41,7 +41,7 @@ func (this GoMybatisSqlBuilder) New(ExpressionTypeConvert ExpressionTypeConvert,
 	this.expressionEngineProxy = expressionEngine
 	this.enableLog = enableLog
 	if enableLog {
-		var logSystem, err = LogSystem{}.New(log, 1000, Log_Mode_async)
+		var logSystem, err = LogSystem{}.New(log, log.QueueLen())
 		if err != nil {
 			panic(err)
 		}
diff --git a/example/Example_test.go b/example/Example_test.go
index 79f11b7..2923c7f 100644
--- a/example/Example_test.go
+++ b/example/Example_test.go
@@ -48,7 +48,7 @@ func init() {
 
 	bytes, _ := ioutil.ReadAll(file)
 	//设置对应的mapper xml文件
-	GoMybatis.WriteMapperPtrByEngine(&exampleActivityMapper, bytes, engine, true)
+	GoMybatis.WriteMapperPtrByEngine(&exampleActivityMapper, bytes, engine, true,nil)
 }
 
 //插入