diff --git a/README.md b/README.md
index e88cc7c..fc7767e 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 [![GoDoc](https://godoc.org/github.com/antlinker/go-dirtyfilter?status.svg)](https://godoc.org/github.com/antlinker/go-dirtyfilter)
 [![wercker status](https://app.wercker.com/status/02cb69dcbba94ee4274f1c0c06ce68f9/s "wercker status")](https://app.wercker.com/project/bykey/02cb69dcbba94ee4274f1c0c06ce68f9)
 
+> 基于DFA算法；
 > 支持动态修改敏感词，同时支持特殊字符的筛选；
 > 敏感词的存储支持内存存储及MongoDB存储。
 
@@ -25,7 +26,7 @@ import (
 )
 
 var (
-  filterText = `我是需要过滤的内容，内容为：**文**件，需要过滤。。。`
+  filterText = `我是需要过滤的内容，内容为：**文@@件，需要过滤。。。`
 )
 
 func main() {
@@ -36,7 +37,7 @@ func main() {
     panic(err)
   }
   filterManage := filter.NewDirtyManager(memStore)
-  result, err := filterManage.Filter().Filter(&filterText, '*')
+  result, err := filterManage.Filter().Filter(filterText, '*', '@')
   if err != nil {
     panic(err)
   }
diff --git a/filter.go b/filter.go
index b1a74cc..8fe2ac1 100644
--- a/filter.go
+++ b/filter.go
@@ -10,13 +10,13 @@ type DirtyFilter interface {
 	// excludes 表示排除指定的字符
 	// 返回文本中出现的敏感词,如果敏感词不存在则返回nil
 	// 如果出现异常，则返回error
-	Filter(text *string, excludes ...rune) ([]string, error)
+	Filter(text string, excludes ...rune) ([]string, error)
 
 	// FilterResult 文本过滤函数
 	// excludes 表示排除指定的字符
 	// 返回文本中出现的敏感词及出现次数,如果敏感词不存在则返回nil
 	// 如果出现异常，则返回error
-	FilterResult(text *string, excludes ...rune) (map[string]int, error)
+	FilterResult(text string, excludes ...rune) (map[string]int, error)
 
 	// FilterReader 从可读流中过滤敏感词
 	// excludes 表示排除指定的字符
diff --git a/nodefilter.go b/nodefilter.go
index 464bda9..0f7b1cb 100644
--- a/nodefilter.go
+++ b/nodefilter.go
@@ -85,14 +85,14 @@ func (nf *nodeFilter) addDirtyWords(text string) {
 	n.end = true
 }
 
-func (nf *nodeFilter) Filter(text *string, excludes ...rune) ([]string, error) {
-	buf := bytes.NewBufferString(*text)
+func (nf *nodeFilter) Filter(text string, excludes ...rune) ([]string, error) {
+	buf := bytes.NewBufferString(text)
 	defer buf.Reset()
 	return nf.FilterReader(buf, excludes...)
 }
 
-func (nf *nodeFilter) FilterResult(text *string, excludes ...rune) (map[string]int, error) {
-	buf := bytes.NewBufferString(*text)
+func (nf *nodeFilter) FilterResult(text string, excludes ...rune) (map[string]int, error) {
+	buf := bytes.NewBufferString(text)
 	defer buf.Reset()
 	return nf.FilterReaderResult(buf, excludes...)
 }
diff --git a/sample/memory/main.go b/sample/memory/main.go
index 67832f5..dddb36a 100644
--- a/sample/memory/main.go
+++ b/sample/memory/main.go
@@ -8,7 +8,7 @@ import (
 )
 
 var (
-	filterText = `我是需要过滤的内容，内容为：**文**件，需要过滤。。。`
+	filterText = `我是需要过滤的内容，内容为：**文@@件，需要过滤。。。`
 )
 
 func main() {
@@ -19,7 +19,7 @@ func main() {
 		panic(err)
 	}
 	filterManage := filter.NewDirtyManager(memStore)
-	result, err := filterManage.Filter().Filter(&filterText, '*')
+	result, err := filterManage.Filter().Filter(filterText, '*', '@')
 	if err != nil {
 		panic(err)
 	}