diff --git a/crypto/md5.go b/crypto/md5.go
index 7ff59e8..4550193 100644
--- a/crypto/md5.go
+++ b/crypto/md5.go
@@ -1,8 +1,12 @@
 package crypto
 
 import (
+	"bufio"
 	"crypto/md5"
 	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
 	"strings"
 )
 
@@ -17,3 +21,35 @@ func (c *Crypto) Md5Encode(data string) string {
 	h.Write([]byte(data))
 	return hex.EncodeToString(h.Sum(nil))
 }
+
+// Md5File return the md5 value of file
+func (c *Crypto) Md5EncodeFile(filename string) (string, error) {
+	if fileInfo, err := os.Stat(filename); err != nil {
+		return "", err
+	} else if fileInfo.IsDir() {
+		return "", nil
+	}
+
+	file, err := os.Open(filename)
+	if err != nil {
+		return "", err
+	}
+	defer file.Close()
+
+	hash := md5.New()
+
+	chunkSize := 65536
+	for buf, reader := make([]byte, chunkSize), bufio.NewReader(file); ; {
+		n, err := reader.Read(buf)
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return "", err
+		}
+		hash.Write(buf[:n])
+	}
+
+	checksum := fmt.Sprintf("%x", hash.Sum(nil))
+	return checksum, nil
+}
diff --git a/crypto/md5_test.go b/crypto/md5_test.go
index 754e566..f9183ed 100644
--- a/crypto/md5_test.go
+++ b/crypto/md5_test.go
@@ -14,3 +14,9 @@ func TestMd5(tt *testing.T) {
 	//true
 
 }
+
+func TestCrypto_Md5EncodeFile(t *testing.T) {
+	filePath := "./md5.go"
+	fmt.Println(cryptoTool.Md5EncodeFile(filePath))
+	//fea07bd54d5c1841a682b408fbbb0cf8 <nil>
+}
diff --git a/str/bit62_test.go b/str/bit62_test.go
index a4699f4..7f47afc 100644
--- a/str/bit62_test.go
+++ b/str/bit62_test.go
@@ -29,3 +29,10 @@ func TestBit62Add(t *testing.T) {
 	fmt.Println(StrTool.Bit62Add("ly7vp", "1"))
 
 }
+
+func FuzzStr_Bit62Encode(f *testing.F) {
+	f.Fuzz(func(t *testing.T, a int64) {
+		fmt.Println(a)
+		fmt.Println(StrTool.Bit62Encode(a))
+	})
+}