diff --git a/dec_float.go b/dec_float.go
index a03d61e..44c2510 100644
--- a/dec_float.go
+++ b/dec_float.go
@@ -2,7 +2,6 @@ package jx
 
 import (
 	"bytes"
-	"encoding/json"
 	"io"
 	"math/big"
 	"strconv"
@@ -349,12 +348,3 @@ func validateFloat(str []byte) error {
 	}
 	return nil
 }
-
-// Number reads json.Number.
-func (d *Decoder) Number() (json.Number, error) {
-	str, err := d.numberAppend(nil)
-	if err != nil {
-		return "", err
-	}
-	return json.Number(str), nil
-}
diff --git a/float_test.go b/float_test.go
index b1924d7..8451c61 100644
--- a/float_test.go
+++ b/float_test.go
@@ -33,14 +33,6 @@ func Test_read_big_int(t *testing.T) {
 	should.Equal(`92233720368547758079223372036854775807`, val.String())
 }
 
-func Test_read_number(t *testing.T) {
-	should := require.New(t)
-	iter := DecodeStr(`92233720368547758079223372036854775807`)
-	val, err := iter.Number()
-	should.NoError(err)
-	should.Equal(`92233720368547758079223372036854775807`, string(val))
-}
-
 func Test_encode_inf(t *testing.T) {
 	should := require.New(t)
 	_, err := json.Marshal(math.Inf(1))