diff --git a/outputer.go b/outputer.go
index 5a6aa43e..fa6f3a0d 100644
--- a/outputer.go
+++ b/outputer.go
@@ -82,8 +82,8 @@ func (c Carbon) ToWeekString(timezone ...string) string {
 	}
 	if months, ok := c.lang.resources["weeks"]; ok {
 		slice := strings.Split(months, "|")
-		if len(slice) == 7 {
-			return slice[c.Week()]
+		if len(slice) == DaysPerWeek {
+			return slice[c.DayOfWeek()%DaysPerWeek]
 		}
 	}
 	return ""
@@ -92,10 +92,6 @@ func (c Carbon) ToWeekString(timezone ...string) string {
 // ToShortWeekString outputs a string in short week layout like "Sun", i18n is supported.
 // 输出缩写星期字符串，支持i18n
 func (c Carbon) ToShortWeekString(timezone ...string) string {
-	return c.toWeekString("short_weeks", timezone)
-}
-
-func (c Carbon) toWeekString(resourceKey string, timezone []string) string {
 	if len(timezone) > 0 {
 		c.loc, c.Error = getLocationByTimezone(timezone[0])
 	}
@@ -105,7 +101,7 @@ func (c Carbon) toWeekString(resourceKey string, timezone []string) string {
 	if len(c.lang.resources) == 0 {
 		c.lang.SetLocale(defaultLocale)
 	}
-	if months, ok := c.lang.resources[resourceKey]; ok {
+	if months, ok := c.lang.resources["short_weeks"]; ok {
 		slice := strings.Split(months, "|")
 		if len(slice) == DaysPerWeek {
 			return slice[c.DayOfWeek()%DaysPerWeek]
diff --git a/outputer_test.go b/outputer_test.go
index 4083b176..45a0a80b 100644
--- a/outputer_test.go
+++ b/outputer_test.go
@@ -2,11 +2,10 @@ package carbon
 
 import (
 	"fmt"
+	"github.com/stretchr/testify/assert"
 	"strconv"
 	"testing"
 	"time"
-
-	"github.com/stretchr/testify/assert"
 )
 
 func TestCarbon_String(t *testing.T) {
@@ -1791,6 +1790,7 @@ func TestCarbon_ToStdTime(t *testing.T) {
 	assert.Equal(t, expected, actual)
 }
 
+// https://github.com/golang-module/carbon/issues/200
 func TestCarbon_Issue200(t *testing.T) {
 	assert := assert.New(t)