diff --git a/protocol/vm/types.go b/protocol/vm/types.go
index 99b0c98d8..771d71a32 100644
--- a/protocol/vm/types.go
+++ b/protocol/vm/types.go
@@ -62,9 +62,10 @@ func bigIntInt64(n *uint256.Int) (int64, error) {
 
 // reverse []byte.
 func reverse(b []byte) []byte {
-	for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
-		b[i], b[j] = b[j], b[i]
+	r := make([]byte, len(b))
+	copy(r, b)
+	for i, j := 0, len(r)-1; i < j; i, j = i+1, j-1 {
+		r[i], r[j] = r[j], r[i]
 	}
-
-	return b
+	return r
 }
diff --git a/protocol/vm/types_test.go b/protocol/vm/types_test.go
index 626a7ca8d..1e75f8098 100644
--- a/protocol/vm/types_test.go
+++ b/protocol/vm/types_test.go
@@ -3,6 +3,7 @@ package vm
 import (
 	"bytes"
 	"math/big"
+	"reflect"
 	"testing"
 
 	"github.com/holiman/uint256"
@@ -136,3 +137,49 @@ func TestInt64BigIntConvert(t *testing.T) {
 		}
 	}
 }
+
+func Test_reverse(t *testing.T) {
+	type args struct {
+		b []byte
+	}
+	type wants struct {
+		origin []byte
+		want   []byte
+	}
+	tests := []struct {
+		name  string
+		args  args
+		wants wants
+	}{
+		{
+			name: "test reverse",
+			args: args{
+				b: []byte{0x00, 0x00, 0x00, 0x00, 0x01},
+			},
+			wants: wants{
+				origin: []byte{0x00, 0x00, 0x00, 0x00, 0x01},
+				want:   []byte{0x01, 0x00, 0x00, 0x00, 0x00},
+			},
+		},
+		{
+			name: "test reverse 1",
+			args: args{
+				b: []byte{0x01, 0x02, 0x20, 0x03, 0x01},
+			},
+			wants: wants{
+				origin: []byte{0x01, 0x02, 0x20, 0x03, 0x01},
+				want:   []byte{0x01, 0x03, 0x20, 0x02, 0x01},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := reverse(tt.args.b); !reflect.DeepEqual(got, tt.wants.want) {
+				t.Errorf("reverse() = %v, want %v", got, tt.wants.want)
+			}
+			if !reflect.DeepEqual(tt.args.b, tt.wants.origin) {
+				t.Errorf("after reverse args = %v, origin %v", tt.args.b, tt.wants.origin)
+			}
+		})
+	}
+}
diff --git a/protocol/vm/vmutil/script_test.go b/protocol/vm/vmutil/script_test.go
index db794d795..eefb9f7b7 100644
--- a/protocol/vm/vmutil/script_test.go
+++ b/protocol/vm/vmutil/script_test.go
@@ -3,6 +3,7 @@ package vmutil
 import (
 	"crypto/ed25519"
 	"encoding/hex"
+	"reflect"
 	"testing"
 
 	"github.com/bytom/bytom/errors"
@@ -211,10 +212,16 @@ func TestGetIssuanceProgramRestrictHeight(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-
+		originProgram := make([]byte, len(program))
+		copy(originProgram, program)
 		gotHeight := GetIssuanceProgramRestrictHeight(program)
 		if gotHeight != test.wantHeight {
 			t.Errorf("TestGetIssuanceProgramRestrictHeight #%d failed: got %d want %d", i, gotHeight, test.wantHeight)
+			return
+		}
+
+		if !reflect.DeepEqual(originProgram, program) {
+			t.Errorf("TestGetIssuanceProgramRestrictHeight #%d failed: after got %v before %v", i, program, originProgram)
 		}
 	}
 }