diff --git a/src/server/game/mod_factory.go b/src/server/game/mod_factory.go
index 3b8c07bb..458a94dc 100644
--- a/src/server/game/mod_factory.go
+++ b/src/server/game/mod_factory.go
@@ -1,6 +1,7 @@
 package game
 
 import (
+	"server/game/mod/card"
 	"server/game/mod/chess"
 	"server/game/mod/decorate"
 	limitedTimeEvent "server/game/mod/limited_time_event"
@@ -17,3 +18,7 @@ func (p *Player) GetDecorateMod() *decorate.Decorate {
 func (p *Player) GetLimitEventMod() *limitedTimeEvent.LimitedTimeEventMod {
 	return p.PlayMod.getLimitedTimeEventMod()
 }
+
+func (p *Player) GetCardMod() *card.CardMod {
+	return p.PlayMod.getCardMod()
+}
diff --git a/src/server/game_util/mathUtil.go b/src/server/game_util/mathUtil.go
index 709ff822..47e65f93 100644
--- a/src/server/game_util/mathUtil.go
+++ b/src/server/game_util/mathUtil.go
@@ -1,5 +1,7 @@
 package GoUtil
 
+import "math/rand"
+
 func RandNum(start int, end int) int {
 	if start > end {
 		return 0
@@ -7,5 +9,5 @@ func RandNum(start int, end int) int {
 	if start == end {
 		return start
 	}
-	return start + GetRand().Intn(end-start+1)
+	return start + rand.Intn(end-start+1)
 }
diff --git a/src/server/game_util/sliceUtil.go b/src/server/game_util/sliceUtil.go
index be29b52d..268c8402 100644
--- a/src/server/game_util/sliceUtil.go
+++ b/src/server/game_util/sliceUtil.go
@@ -2,6 +2,7 @@ package GoUtil
 
 import (
 	"fmt"
+	"math/rand"
 	"reflect"
 	"server/game/mod/item"
 	"sort"
@@ -51,7 +52,7 @@ func RandPopSlice(slice []int) ([]int, int) {
 	if slen == 0 {
 		return slice, -1
 	}
-	Id := GetRand().Intn(slen)
+	Id := rand.Intn(slen)
 	Val := slice[Id]
 	Slice2 := append(slice[0:Id], slice[Id+1:]...)
 	return Slice2, Val
@@ -62,7 +63,7 @@ func RandSlice(slice []int) int {
 	if slen == 0 {
 		return 0
 	}
-	Id := GetRand().Intn(slen)
+	Id := rand.Intn(slen)
 	return slice[Id]
 }
 
@@ -71,7 +72,7 @@ func RandItem(slice []*item.Item) *item.Item {
 	if slen == 0 {
 		return nil
 	}
-	Id := GetRand().Intn(slen)
+	Id := rand.Intn(slen)
 	return slice[Id]
 }
 
@@ -84,7 +85,7 @@ func RandSliceNum(s []int, num int) []int {
 	}
 
 	for i := 0; i < num; i++ {
-		Id := GetRand().Intn(len(slice))
+		Id := rand.Intn(len(slice))
 		r = append(r, slice[Id])
 		slice = append(slice[0:Id], slice[Id+1:]...)
 	}
@@ -100,7 +101,7 @@ func RandSliceNum2(s []interface{}, num int) []interface{} {
 	}
 
 	for i := 0; i < num; i++ {
-		Id := GetRand().Intn(len(slice))
+		Id := rand.Intn(len(slice))
 		r = append(r, slice[Id])
 		slice = append(slice[0:Id], slice[Id+1:]...)
 	}
@@ -116,7 +117,7 @@ func RandSliceNumNonAdjacent(s []int, num int) []int {
 	sort.Ints(slice)
 	result := make([]int, 0, num)
 	for len(result) < num {
-		Id := GetRand().Intn(len(slice))
+		Id := rand.Intn(len(slice))
 		result = append(result, slice[Id])
 		slice = SubAdjacentElemSlice(slice, Id)
 	}
@@ -138,7 +139,7 @@ func RandStringSlice(slice []string) string {
 	if slen == 0 {
 		return ""
 	}
-	Id := GetRand().Intn(slen)
+	Id := rand.Intn(slen)
 	return slice[Id]
 }
 
@@ -335,7 +336,7 @@ func PopStringArray(s []string) (string, []string) {
 
 func ShuffleStringArray(s []string) []string {
 	r := make([]string, len(s))
-	perm := GetRand().Perm(len(s))
+	perm := rand.Perm(len(s))
 	for i, v := range perm {
 		r[v] = s[i]
 	}
@@ -344,7 +345,7 @@ func ShuffleStringArray(s []string) []string {
 
 func ShuffleArray(s []int) []int {
 	r := make([]int, len(s))
-	perm := GetRand().Perm(len(s))
+	perm := rand.Perm(len(s))
 	for i, v := range perm {
 		r[v] = s[i]
 	}
diff --git a/src/server/test/fix_test.go b/src/server/test/fix_test.go
index ea90b595..dc537a18 100644
--- a/src/server/test/fix_test.go
+++ b/src/server/test/fix_test.go
@@ -78,3 +78,14 @@ func TestFixUserData(t *testing.T) {
 	}
 	log.Debug("All accounts fixed")
 }
+
+func TestRandInt(t *testing.T) {
+	p1 := new(game.Player)
+	p1.InitPlayer("3625212")
+	CardMod := p1.GetCardMod()
+	CardMod.CardLimit = true
+	for i := 0; i < 20; i++ {
+		cardid, _ := CardMod.OpenCardPack(5)
+		log.Debug("cardid is %d", cardid)
+	}
+}