diff --git a/core.go b/core.go
index 41d7145..9cd9810 100644
--- a/core.go
+++ b/core.go
@@ -1,7 +1,6 @@
 package time_arrow
 
 import (
-	"errors"
 	"fmt"
 	"github.com/google/uuid"
 	"log"
@@ -40,10 +39,6 @@ type TimeArrow struct {
 
 type TimeArrows []TimeArrow
 
-var GetData = func(group string) (TimeArrows, error) {
-	return nil, errors.New("GetData 未实现")
-}
-
 func isInDateSlice(t time.Time, ta TimeArrow) bool {
 	for e := range ta.DateSlice {
 		startStr := ta.DateSlice[e].Start
@@ -213,8 +208,12 @@ func CreateDateSliceTypePlan(group string, dateSlice []DateSlice, timesOnDay []s
 	}
 }
 
-func GetHitTimeArrow(t time.Time, group string, expandTags ...string) (*TimeArrow, error) {
-	ta, err := GetData(group)
+type TimeArrowHelper struct {
+	GetData func(group string) (TimeArrows, error)
+}
+
+func (th *TimeArrowHelper) GetHitTimeArrow(t time.Time, group string, expandTags ...string) (*TimeArrow, error) {
+	ta, err := th.GetData(group)
 	if err != nil {
 		return nil, err
 	}
diff --git a/core_test.go b/core_test.go
index 5a27cb2..abcc32b 100644
--- a/core_test.go
+++ b/core_test.go
@@ -150,6 +150,8 @@ func Test_isInExpandTags(t *testing.T) {
 
 }
 
+var th TimeArrowHelper
+
 func TestGetHitTimeArrow(t *testing.T) {
 	tas := TimeArrows{
 		{
@@ -242,7 +244,7 @@ func TestGetHitTimeArrow(t *testing.T) {
 		},
 	}
 
-	GetData = func(group string) (arrows TimeArrows, e error) {
+	th.GetData = func(group string) (arrows TimeArrows, e error) {
 		return tas, nil
 	}
 
@@ -251,7 +253,7 @@ func TestGetHitTimeArrow(t *testing.T) {
 		panic(err)
 	}
 
-	result, err := GetHitTimeArrow(ti, "", "一号场")
+	result, err := th.GetHitTimeArrow(ti, "", "一号场")
 	if err != nil || result == nil {
 		t.Fatal("error")
 		panic(err)
@@ -262,7 +264,7 @@ func TestGetHitTimeArrow(t *testing.T) {
 	}
 
 	ti = ti.AddDate(0, 0, -1)
-	result, err = GetHitTimeArrow(ti, "", "一号场")
+	result, err = th.GetHitTimeArrow(ti, "", "一号场")
 	if err != nil || result == nil {
 		t.Fatal("error")
 		panic(err)
@@ -271,7 +273,7 @@ func TestGetHitTimeArrow(t *testing.T) {
 	if result.ExpandValue.(int) != 30 {
 		t.Fatal("error", result.ExpandValue.(int))
 	}
-	result, err = GetHitTimeArrow(ti, "", "三号场")
+	result, err = th.GetHitTimeArrow(ti, "", "三号场")
 	if err != nil || result == nil {
 		t.Fatal("error")
 		panic(err)
@@ -286,7 +288,7 @@ func TestGetHitTimeArrow(t *testing.T) {
 		panic(err)
 	}
 
-	result, err = GetHitTimeArrow(ti, "", "三号场")
+	result, err = th.GetHitTimeArrow(ti, "", "三号场")
 	if err != nil || result == nil {
 		t.Fatal("error")
 		panic(err)
@@ -297,7 +299,7 @@ func TestGetHitTimeArrow(t *testing.T) {
 	}
 
 	ti = ti.Add(time.Hour)
-	result, err = GetHitTimeArrow(ti, "", "三号场")
+	result, err = th.GetHitTimeArrow(ti, "", "三号场")
 	if err != nil || result == nil {
 		t.Fatal("error")
 		panic(err)