diff --git a/math/big/decimal.go b/math/big/decimal.go
index a35e7fe..dc34040 100644
--- a/math/big/decimal.go
+++ b/math/big/decimal.go
@@ -391,8 +391,13 @@ func (d *Decimal) ToString() (str []byte) {
 	return
 }
 
-// FromString parses decimal from string.
-func (d *Decimal) FromString(str []byte) error {
+// FromBytes parses decimal from string.
+func (d *Decimal) FromString(str string) error {
+	return d.FromBytes([]byte(str))
+}
+
+// FromBytes parses decimal from bytes.
+func (d *Decimal) FromBytes(str []byte) error {
 	for i := 0; i < len(str); i++ {
 		if !isSpace(str[i]) {
 			str = str[i:]
@@ -1077,7 +1082,7 @@ func (d *Decimal) ToUint() (uint64, error) {
 // FromFloat64 creates a decimal from float64 value.
 func (d *Decimal) FromFloat64(f float64) error {
 	s := strconv.FormatFloat(f, 'g', -1, 64)
-	return d.FromString([]byte(s))
+	return d.FromBytes([]byte(s))
 }
 
 // ToFloat64 converts decimal to float64 value.
@@ -2277,7 +2282,7 @@ func NewDecFromFloatForTest(f float64) *Decimal {
 // NewDecFromStringForTest creates a Decimal from string, as it returns no error, it should only be used in test.
 func NewDecFromStringForTest(s string) *Decimal {
 	dec := new(Decimal)
-	_ = dec.FromString([]byte(s))
+	_ = dec.FromBytes([]byte(s))
 	//todo terror.Log(errors.Trace(err))
 	return dec
 }
@@ -2295,7 +2300,7 @@ func NewMaxOrMinDec(negative bool, prec, frac int) *Decimal {
 	}
 	str[1+prec-frac] = '.'
 	dec := new(Decimal)
-	_ = dec.FromString(str)
+	_ = dec.FromBytes(str)
 	//todo terror.Log(errors.Trace(err))
 	return dec
 }
diff --git a/math/big/decimal_benchmark_test.go b/math/big/decimal_benchmark_test.go
index 670add5..923b6fe 100644
--- a/math/big/decimal_benchmark_test.go
+++ b/math/big/decimal_benchmark_test.go
@@ -45,7 +45,7 @@ func BenchmarkRound(b *testing.B) {
 	}
 
 	for i := 0; i < len(tests); i++ {
-		tests[i].inputDec.FromString([]byte(tests[i].input))
+		tests[i].inputDec.FromBytes([]byte(tests[i].input))
 	}
 
 	b.StartTimer()
diff --git a/math/big/decimal_test.go b/math/big/decimal_test.go
index 31fd2b3..5165683 100644
--- a/math/big/decimal_test.go
+++ b/math/big/decimal_test.go
@@ -78,7 +78,7 @@ func TestToInt(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var dec Decimal
-		dec.FromString([]byte(tt.input))
+		dec.FromBytes([]byte(tt.input))
 		result, ec := dec.ToInt()
 		assert.Equal(t, ec, tt.err)
 		assert.Equal(t, result, tt.output)
@@ -102,7 +102,7 @@ func TestToUint(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var dec Decimal
-		_ = dec.FromString([]byte(tt.input))
+		_ = dec.FromBytes([]byte(tt.input))
 		result, ec := dec.ToUint()
 		assert.Equal(t, ec, tt.err)
 		assert.Equal(t, result, tt.output)
@@ -140,7 +140,7 @@ func TestToFloat(t *testing.T) {
 	}
 	for _, ca := range tests {
 		var dec Decimal
-		_ = dec.FromString([]byte(ca.s))
+		_ = dec.FromBytes([]byte(ca.s))
 		f, _ := dec.ToFloat64()
 		assert.Equal(t, f, ca.f)
 	}
@@ -164,7 +164,7 @@ func TestToHashKey(t *testing.T) {
 		keys := make([]string, 0, len(ca.numbers))
 		for _, num := range ca.numbers {
 			var dec Decimal
-			assert.Equal(t, dec.FromString([]byte(num)), nil)
+			assert.Equal(t, dec.FromBytes([]byte(num)), nil)
 			key, err := dec.ToHashKey()
 			assert.Equal(t, err, nil)
 			keys = append(keys, string(key))
@@ -200,14 +200,14 @@ func TestToHashKey(t *testing.T) {
 		keys := make([]string, 0, len(ca.hashNumbers)+len(ca.binNumbers))
 		for _, num := range ca.hashNumbers {
 			var dec Decimal
-			assert.Equal(t, dec.FromString([]byte(num)), nil)
+			assert.Equal(t, dec.FromBytes([]byte(num)), nil)
 			key, err := dec.ToHashKey()
 			assert.Equal(t, err, nil)
 			keys = append(keys, string(key))
 		}
 		for _, num := range ca.binNumbers {
 			var dec Decimal
-			assert.Equal(t, dec.FromString([]byte(num)), nil)
+			assert.Equal(t, dec.FromBytes([]byte(num)), nil)
 			prec, frac := dec.PrecisionAndFrac() // remove leading zeros but trailing zeros remain
 			key, err := dec.ToBin(prec, frac)
 			assert.Equal(t, err, nil)
@@ -231,7 +231,7 @@ func TestRemoveTrailingZeros(t *testing.T) {
 	}
 	for _, ca := range tests {
 		var dec Decimal
-		assert.Equal(t, dec.FromString([]byte(ca)), nil)
+		assert.Equal(t, dec.FromBytes([]byte(ca)), nil)
 
 		// calculate the number of digits after point but trailing zero
 		digitsFracExp := 0
@@ -263,7 +263,7 @@ func TestShift(t *testing.T) {
 	var dotest = func(t *testing.T, tests []tcase) {
 		for _, ca := range tests {
 			var dec Decimal
-			err := dec.FromString([]byte(ca.input))
+			err := dec.FromBytes([]byte(ca.input))
 			//assert.Equal(t, err, IsNil)
 			//origin := dec
 			err = dec.Shift(ca.shift)
@@ -394,7 +394,7 @@ func TestRoundWithHalfEven(t *testing.T) {
 
 	for _, ca := range tests {
 		var dec Decimal
-		dec.FromString([]byte(ca.input))
+		dec.FromBytes([]byte(ca.input))
 		var rounded Decimal
 		err := dec.Round(&rounded, ca.scale, ModeHalfEven)
 		assert.Equal(t, err, ca.err)
@@ -428,7 +428,7 @@ func TestRoundWithTruncate(t *testing.T) {
 	}
 	for _, ca := range tests {
 		var dec Decimal
-		dec.FromString([]byte(ca.input))
+		dec.FromBytes([]byte(ca.input))
 		var rounded Decimal
 		err := dec.Round(&rounded, ca.scale, ModeTruncate)
 		assert.Equal(t, err, ca.err)
@@ -463,7 +463,7 @@ func TestRoundWithCeil(t *testing.T) {
 	}
 	for _, ca := range tests {
 		var dec Decimal
-		dec.FromString([]byte(ca.input))
+		dec.FromBytes([]byte(ca.input))
 		var rounded Decimal
 		err := dec.Round(&rounded, ca.scale, modeCeiling)
 		assert.Equal(t, err, ca.err)
@@ -490,7 +490,7 @@ func TestFromString(t *testing.T) {
 	}
 	for _, ca := range tests {
 		var dec Decimal
-		err := dec.FromString([]byte(ca.input))
+		err := dec.FromBytes([]byte(ca.input))
 		if err != nil {
 			assert.Equal(t, err, ca.err)
 		}
@@ -504,7 +504,7 @@ func TestFromString(t *testing.T) {
 	}
 	for _, ca := range tests {
 		var dec Decimal
-		err := dec.FromString([]byte(ca.input))
+		err := dec.FromBytes([]byte(ca.input))
 		assert.Equal(t, err, ca.err)
 		result := string(dec.ToString())
 		assert.Equal(t, result, ca.output)
@@ -524,7 +524,7 @@ func TestToString(t *testing.T) {
 	}
 	for _, ca := range tests {
 		var dec Decimal
-		_ = dec.FromString([]byte(ca.input))
+		_ = dec.FromBytes([]byte(ca.input))
 		result := dec.ToString()
 		assert.Equal(t, string(result), ca.output)
 	}
@@ -557,7 +557,7 @@ func TestToBinFromBin(t *testing.T) {
 	}
 	for _, ca := range tests {
 		var dec Decimal
-		err := dec.FromString([]byte(ca.input))
+		err := dec.FromBytes([]byte(ca.input))
 		assert.Equal(t, err, nil)
 		buf, err := dec.ToBin(ca.precision, ca.frac)
 		assert.Equal(t, err, ca.err)
@@ -605,8 +605,8 @@ func TestCompare(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var a, b Decimal
-		_ = a.FromString([]byte(tt.a))
-		_ = b.FromString([]byte(tt.b))
+		_ = a.FromBytes([]byte(tt.a))
+		_ = b.FromBytes([]byte(tt.b))
 		assert.Equal(t, a.Compare(&b), tt.cmp)
 	}
 }
@@ -721,8 +721,8 @@ func TestSub(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var a, b, sum Decimal
-		a.FromString([]byte(tt.a))
-		b.FromString([]byte(tt.b))
+		a.FromBytes([]byte(tt.a))
+		b.FromBytes([]byte(tt.b))
 		err := DecimalSub(&a, &b, &sum)
 		assert.Equal(t, err, tt.err)
 		result := sum.ToString()
@@ -752,8 +752,8 @@ func TestMul(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var a, b, product Decimal
-		a.FromString([]byte(tt.a))
-		b.FromString([]byte(tt.b))
+		a.FromBytes([]byte(tt.a))
+		b.FromBytes([]byte(tt.b))
 		err := DecimalMul(&a, &b, &product)
 		assert.Equal(t, err, tt.err)
 		result := product.String()
@@ -787,8 +787,8 @@ func TestDivMod(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var a, b, to Decimal
-		a.FromString([]byte(tt.a))
-		b.FromString([]byte(tt.b))
+		a.FromBytes([]byte(tt.a))
+		b.FromBytes([]byte(tt.b))
 		err := doDivMod(&a, &b, &to, nil, 5)
 		assert.Equal(t, err, tt.err)
 		if tt.err == ErrDivByZero {
@@ -809,8 +809,8 @@ func TestDivMod(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var a, b, to Decimal
-		a.FromString([]byte(tt.a))
-		b.FromString([]byte(tt.b))
+		a.FromBytes([]byte(tt.a))
+		b.FromBytes([]byte(tt.b))
 		ec := doDivMod(&a, &b, nil, &to, 0)
 		assert.Equal(t, ec, tt.err)
 		if tt.err == ErrDivByZero {
@@ -829,8 +829,8 @@ func TestDivMod(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var a, b, to Decimal
-		a.FromString([]byte(tt.a))
-		b.FromString([]byte(tt.b))
+		a.FromBytes([]byte(tt.a))
+		b.FromBytes([]byte(tt.b))
 		ec := DecimalDiv(&a, &b, &to, DivFracIncr)
 		assert.Equal(t, ec, tt.err)
 		if tt.err == ErrDivByZero {
@@ -847,8 +847,8 @@ func TestDivMod(t *testing.T) {
 	}
 	for _, tt := range tests {
 		var a, b, to Decimal
-		_ = a.FromString([]byte(tt.a))
-		_ = b.FromString([]byte(tt.b))
+		_ = a.FromBytes([]byte(tt.a))
+		_ = b.FromBytes([]byte(tt.b))
 		ec := DecimalMod(&a, &b, &to)
 		assert.Equal(t, ec, tt.err)
 		if tt.err == ErrDivByZero {
@@ -892,7 +892,7 @@ func BenchmarkBigDecimalToBin(b *testing.B) {
 	decs := make([]*Decimal, 0, len(cases))
 	for _, ca := range cases {
 		var dec Decimal
-		if err := dec.FromString([]byte(ca)); err != nil {
+		if err := dec.FromBytes([]byte(ca)); err != nil {
 			b.Fatal(err)
 		}
 		decs = append(decs, &dec)
@@ -915,7 +915,7 @@ func BenchmarkBigDecimalToHashKey(b *testing.B) {
 	decs := make([]*Decimal, 0, len(cases))
 	for _, ca := range cases {
 		var dec Decimal
-		if err := dec.FromString([]byte(ca)); err != nil {
+		if err := dec.FromBytes([]byte(ca)); err != nil {
 			b.Fatal(err)
 		}
 		decs = append(decs, &dec)