diff --git a/.gitignore b/.gitignore
index cb30448..c183848 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 afero-demo
 *.exe
-go.sum
\ No newline at end of file
+go.sum
+*.txt
\ No newline at end of file
diff --git a/main.go b/main.go
index daec585..293eec8 100644
--- a/main.go
+++ b/main.go
@@ -18,4 +18,28 @@ func main() {
 	}
 
 	fmt.Println(string(data))
+
+	//真实文件系统
+	fs = afero.NewOsFs()
+
+	afero.WriteFile(fs, "poem.txt", []byte("月光光，照大床（文件系统）"), 0644)
+
+	data, err = afero.ReadFile(fs, "poem.txt")
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(string(data))
+
+	//拷贝文件
+	err = afero.WriteFile(fs, "poem_copy.txt", data, 0644)
+	if err != nil {
+		panic(err)
+	}
+
+	//限定根目录
+	bfs := afero.NewBasePathFs(afero.NewOsFs(), "/home/yy/project")
+	if _, err := bfs.Open("/etc/passwd"); err != nil {
+		fmt.Println(err.Error())
+	}
 }