diff --git a/.gitignore b/.gitignore
index ac975c4..375b90e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
-testdata/
+/testdata/
 vendor/
 draft/
 # example/
@@ -7,4 +7,5 @@ default.jpeg
 # *.json
 *.log
 .DS_store
-js/
\ No newline at end of file
+js/
+default.jpeg
\ No newline at end of file
diff --git a/encoder.go b/encoder.go
index 8ed3b9e..1f6e6b2 100644
--- a/encoder.go
+++ b/encoder.go
@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"log"
 
-	"github.com/skip2/go-qrcode/bitset"
+	"github.com/yeqown/reedsolomon/binary"
 )
 
 // EncMode ...
@@ -26,8 +26,8 @@ const (
 )
 
 var (
-	paddingByte1 = bitset.NewFromBase2String("11101100")
-	paddingByte2 = bitset.NewFromBase2String("00010001")
+	paddingByte1, _ = binary.NewFromBinaryString("11101100")
+	paddingByte2, _ = binary.NewFromBinaryString("00010001")
 )
 
 // GetEncModeName ...
@@ -49,16 +49,16 @@ func GetEncModeName(mode EncMode) string {
 }
 
 // getEncodeModeIndicator ...
-func getEncodeModeIndicator(mode EncMode) *bitset.Bitset {
+func getEncodeModeIndicator(mode EncMode) *binary.Binary {
 	switch mode {
 	case EncModeNumeric:
-		return bitset.New(false, false, false, true)
+		return binary.New(false, false, false, true)
 	case EncModeAlphanumeric:
-		return bitset.New(false, false, true, false)
+		return binary.New(false, false, true, false)
 	case EncModeByte:
-		return bitset.New(false, true, false, false)
+		return binary.New(false, true, false, false)
 	case EncModeJP:
-		return bitset.New(true, false, false, false)
+		return binary.New(true, false, false, false)
 	default:
 		panic("no indicator")
 	}
@@ -67,7 +67,7 @@ func getEncodeModeIndicator(mode EncMode) *bitset.Bitset {
 // Encoder ... data to bit stream ...
 type Encoder struct {
 	// self init
-	dst  *bitset.Bitset
+	dst  *binary.Binary
 	data []byte // raw input data
 
 	// initial params
@@ -82,8 +82,8 @@ type Encoder struct {
 // 1. encode raw data into bitset
 // 2. append padding data
 //
-func (e *Encoder) Encode(byts []byte) (*bitset.Bitset, error) {
-	e.dst = bitset.New()
+func (e *Encoder) Encode(byts []byte) (*binary.Binary, error) {
+	e.dst = binary.New()
 	e.data = byts
 
 	// appedn mode indicator symbol
diff --git a/go.mod b/go.mod
index 4c72657..aa53217 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module github.com/yeqown/go-qrcode
 
-require github.com/skip2/go-qrcode v0.0.0-20171229120447-cf5f9fa2f0d8
+require github.com/yeqown/reedsolomon v1.0.0
diff --git a/go.sum b/go.sum
index 663605d..ed997d2 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/skip2/go-qrcode v0.0.0-20171229120447-cf5f9fa2f0d8 h1:5C4yAeYifeRO+7z2/H2kxL8tJZE9ZE9LpxK6YUZPByo=
-github.com/skip2/go-qrcode v0.0.0-20171229120447-cf5f9fa2f0d8/go.mod h1:PLPIyL7ikehBD1OAjmKKiOEhbvWyHGaNDjquXMcYABo=
+github.com/yeqown/reedsolomon v1.0.0 h1:x1h/Ej/uJnNu8jaX7GLHBWmZKCAWjEJTetkqaabr4B0=
+github.com/yeqown/reedsolomon v1.0.0/go.mod h1:P76zpcn2TCuL0ul1Fso373qHRc69LKwAw/Iy6g1WiiM=
diff --git a/qrcode.go b/qrcode.go
index 20513c9..d94eac4 100644
--- a/qrcode.go
+++ b/qrcode.go
@@ -9,9 +9,12 @@ import (
 	"sync"
 	"time"
 
-	"github.com/skip2/go-qrcode/bitset"
-	"github.com/skip2/go-qrcode/reedsolomon"
+	// "github.com/skip2/go-qrcode/bitset"
+	// "github.com/skip2/go-qrcode/reedsolomon"
+
 	"github.com/yeqown/go-qrcode/matrix"
+	"github.com/yeqown/reedsolomon"
+	"github.com/yeqown/reedsolomon/binary"
 )
 
 var (
@@ -61,9 +64,9 @@ type QRCode struct {
 	content string // input text content
 	rawData []byte // raw Data to transfer
 
-	dataBSet *bitset.Bitset // final data bit stream of encode data
+	dataBSet *binary.Binary // final data bit stream of encode data
 	mat      *matrix.Matrix // matrix grid to store final bitmap
-	ecBSet   *bitset.Bitset // final error correction bitset
+	ecBSet   *binary.Binary // final error correction bitset
 
 	v       Version  // version means the size
 	ver     int      // version num
@@ -152,7 +155,7 @@ func (q *QRCode) analyze() error {
 // https://www.thonky.com/qr-code-tutorial/data-encoding
 func (q *QRCode) dataEncoding() (blocks []dataBlock, err error) {
 	var (
-		bset *bitset.Bitset
+		bset *binary.Binary
 	)
 	bset, err = q.encoder.Encode(q.rawData)
 	if err != nil {
@@ -169,7 +172,10 @@ func (q *QRCode) dataEncoding() (blocks []dataBlock, err error) {
 			start = end
 			end = start + g.NumDataCodewords*8
 
-			blocks[blockID].Data = bset.Substr(start, end)
+			blocks[blockID].Data, err = bset.Subset(start, end)
+			if err != nil {
+				panic(err)
+			}
 			blocks[blockID].StartOffset = end - start
 			blocks[blockID].NumECBlock = g.ECBlockwordsPerBlock
 
@@ -182,14 +188,14 @@ func (q *QRCode) dataEncoding() (blocks []dataBlock, err error) {
 
 // dataBlock ...
 type dataBlock struct {
-	Data        *bitset.Bitset
+	Data        *binary.Binary
 	StartOffset int // length
 	NumECBlock  int // error correction codewrods num per data block
 }
 
 // ecBlock ...
 type ecBlock struct {
-	Data *bitset.Bitset
+	Data *binary.Binary
 	// StartOffset int // length
 }
 
@@ -201,7 +207,10 @@ func (q *QRCode) errorCorrectionEncoding(dataBlocks []dataBlock) (blocks []ecBlo
 	for idx, b := range dataBlocks {
 		debugLogf("numOfECBlock: %d", b.NumECBlock)
 		bset := reedsolomon.Encode(b.Data, b.NumECBlock)
-		blocks[idx].Data = bset.Substr(b.StartOffset, bset.Len())
+		blocks[idx].Data, err = bset.Subset(b.StartOffset, bset.Len())
+		if err != nil {
+			panic(err)
+		}
 		// blocks[idx].StartOffset = b.StartOffset
 	}
 	return
@@ -229,10 +238,10 @@ func (q *QRCode) arrarngeBits(dataBlocks []dataBlock, ecBlocks []ecBlock) {
 
 	// check if bitsets initialized, or initial them
 	if q.dataBSet == nil {
-		q.dataBSet = bitset.New()
+		q.dataBSet = binary.New()
 	}
 	if q.ecBSet == nil {
-		q.ecBSet = bitset.New()
+		q.ecBSet = binary.New()
 	}
 
 	for !endFlag {
@@ -243,7 +252,11 @@ func (q *QRCode) arrarngeBits(dataBlocks []dataBlock, ecBlocks []ecBlock) {
 				overflowCnt++
 				continue
 			}
-			q.dataBSet.Append(block.Data.Substr(start, end))
+			subBin, err := block.Data.Subset(start, end)
+			if err != nil {
+				panic(err)
+			}
+			q.dataBSet.Append(subBin)
 			debugLogf("arrange data blocks info: start: %d, end: %d, len: %d, overflowCnt: %d, curIdx: %d",
 				start, end, block.Data.Len(), overflowCnt, curIdx,
 			)
@@ -269,7 +282,11 @@ func (q *QRCode) arrarngeBits(dataBlocks []dataBlock, ecBlocks []ecBlock) {
 				overflowCnt++
 				continue
 			}
-			q.ecBSet.Append(block.Data.Substr(start, end))
+			subBin, err := block.Data.Subset(start, end)
+			if err != nil {
+				panic(err)
+			}
+			q.ecBSet.Append(subBin)
 		}
 		curIdx++
 		// loop finish check
diff --git a/version.go b/version.go
index b91ec9b..d85dd77 100644
--- a/version.go
+++ b/version.go
@@ -4,7 +4,8 @@ import (
 	"errors"
 	"log"
 
-	"github.com/skip2/go-qrcode/bitset"
+	// "github.com/skip2/go-qrcode/bitset"
+	"github.com/yeqown/reedsolomon/binary"
 )
 
 // ECLevel error correction level
@@ -179,12 +180,12 @@ func (v Version) TotalNumBlocks() int {
 }
 
 // VerInfo Version info bitset
-func (v Version) verInfo() *bitset.Bitset {
+func (v Version) verInfo() *binary.Binary {
 	if v.Ver < 7 {
 		return nil
 	}
 
-	result := bitset.New()
+	result := binary.New()
 	result.AppendUint32(versionBitSequence[v.Ver], verInfoBitsNum)
 
 	return result
@@ -192,7 +193,7 @@ func (v Version) verInfo() *bitset.Bitset {
 
 // formatInfo returns the 15-bit Format Information value for a QR
 // code.
-func (v Version) formatInfo(maskPattern int) *bitset.Bitset {
+func (v Version) formatInfo(maskPattern int) *binary.Binary {
 	formatID := 0
 
 	switch v.ECLevel {
@@ -213,7 +214,7 @@ func (v Version) formatInfo(maskPattern int) *bitset.Bitset {
 	}
 
 	formatID |= maskPattern & 0x7
-	result := bitset.New()
+	result := binary.New()
 	result.AppendUint32(formatBitSequence[formatID].regular, formatInfoBitsNum)
 	return result
 }
diff --git a/version_test.go b/version_test.go
index a29d1bf..7c733f3 100644
--- a/version_test.go
+++ b/version_test.go
@@ -4,7 +4,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/skip2/go-qrcode/bitset"
+	"github.com/yeqown/reedsolomon/binary"
 )
 
 // func Test_load(t *testing.T) {
@@ -135,7 +135,7 @@ func TestVersion_verInfo(t *testing.T) {
 	tests := []struct {
 		name   string
 		fields fields
-		want   *bitset.Bitset
+		want   *binary.Binary
 	}{
 		// TODO: Add test cases.
 	}
@@ -170,7 +170,7 @@ func TestVersion_formatInfo(t *testing.T) {
 		name   string
 		fields fields
 		args   args
-		want   *bitset.Bitset
+		want   *binary.Binary
 	}{
 		// TODO: Add test cases.
 	}