diff --git a/__tests__/Solar.test.js b/__tests__/Solar.test.js
index 8e4bac7..37b79c9 100644
--- a/__tests__/Solar.test.js
+++ b/__tests__/Solar.test.js
@@ -134,3 +134,18 @@ test('25', () => {
   })
   expect(timeList).toStrictEqual(['1959-12-17 16:00:00']);
 });
+
+test('26', () => {
+  const solar = Solar.fromYmd(2023, 8, 31);
+  expect(solar.nextMonth(2).toYmd()).toBe('2023-10-31');
+});
+
+test('27', () => {
+  const solar = Solar.fromYmd(2023, 8, 31);
+  expect(solar.nextYear(2).toYmd()).toBe('2025-08-31');
+});
+
+test('28', () => {
+  const solar = Solar.fromYmd(2023, 8, 31);
+  expect(solar.nextMonth(6).toYmd()).toBe('2024-02-29');
+});
diff --git a/lunar.js b/lunar.js
index f40af20..1d65376 100644
--- a/lunar.js
+++ b/lunar.js
@@ -350,19 +350,17 @@
           var y = this._p.year + years;
           var m = this._p.month;
           var d = this._p.day;
-          // 2月处理
-          if (2 === m) {
+          if (1582 === y && 10 === m) {
+            if (d > 4 && d < 15) {
+              d += 10;
+            }
+          } else if (2 === m) {
             if (d > 28) {
               if (!SolarUtil.isLeapYear(y)) {
                 d = 28;
               }
             }
           }
-          if (1582 === y && 10 === m) {
-            if (d > 4 && d < 15) {
-              d += 10;
-            }
-          }
           return _fromYmdHms(y, m, d, this._p.hour, this._p.minute, this._p.second);
         },
         nextMonth:function(months){
@@ -375,18 +373,15 @@
           var y = month.getYear();
           var m = month.getMonth();
           var d = this._p.day;
-          // 2月处理
-          if (2 === m) {
-            if (d > 28) {
-              if (!SolarUtil.isLeapYear(y)) {
-                d = 28;
-              }
-            }
-          }
           if (1582 === y && 10 === m) {
             if (d > 4 && d < 15) {
               d += 10;
             }
+          } else {
+            var maxDay = SolarUtil.getDaysOfMonth(y, m);
+            if (d > maxDay) {
+              d = maxDay;
+            }
           }
           return _fromYmdHms(y, m, d, this._p.hour, this._p.minute, this._p.second);
         },
@@ -4536,7 +4531,7 @@
         '9-9':'{jr.chongYang}',
         '12-8':'{jr.laBa}'
       },
-      OTHER_FESTIVAL:{'1-4':['接神日'],'1-5':['隔开日'],'1-7':['人日'],'1-8':['谷日','顺星节'],'1-9':['天日'],'1-10':['地日'],'1-20':['天穿节'],'1-25':['填仓节'],'1-30':['正月晦'],'2-1':['中和节'],'2-2':['社日节'],'3-3':['上巳节'],'5-20':['分龙节'],'5-25':['会龙节'],'6-6':['天贶节'],'6-24':['观莲节'],'6-25':['五谷母节'],'7-14':['中元节'],'7-22':['财神节'],'7-29':['地藏节'],'8-1':['天灸日'],'10-1':['寒衣节'],'10-10':['十成节'],'10-15':['下元节'],'12-7':['驱傩日'],'12-16':['尾牙'],'12-24':['祭灶日']},
+      OTHER_FESTIVAL:{'1-4':['接神日'],'1-5':['隔开日'],'1-7':['人日'],'1-8':['谷日','顺星节'],'1-9':['天日'],'1-10':['地日'],'1-20':['天穿节'],'1-25':['填仓节'],'1-30':['正月晦'],'2-1':['中和节'],'2-2':['社日节'],'3-3':['上巳节'],'5-20':['分龙节'],'5-25':['会龙节'],'6-6':['天贶节'],'6-24':['观莲节'],'6-25':['五谷母节'],'7-15':['中元节'],'7-22':['财神节'],'7-29':['地藏节'],'8-1':['天灸日'],'10-1':['寒衣节'],'10-10':['十成节'],'10-15':['下元节'],'12-7':['驱傩日'],'12-16':['尾牙'],'12-24':['祭灶日']},
       CHONG:['{dz.wu}', '{dz.wei}', '{dz.shen}', '{dz.you}', '{dz.xu}', '{dz.hai}', '{dz.zi}', '{dz.chou}', '{dz.yin}', '{dz.mao}', '{dz.chen}', '{dz.si}'],
       CHONG_GAN:['{tg.wu}', '{tg.ji}', '{tg.geng}', '{tg.xin}', '{tg.ren}', '{tg.gui}', '{tg.jia}', '{tg.yi}', '{tg.bing}', '{tg.ding}'],
       CHONG_GAN_TIE:['{tg.ji}', '{tg.wu}', '{tg.xin}', '{tg.geng}', '{tg.gui}', '{tg.ren}', '{tg.yi}', '{tg.jia}', '{tg.ding}', '{tg.bing}'],
diff --git a/package.json b/package.json
index 5193634..d1a89e0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lunar-javascript",
-  "version": "1.6.3",
+  "version": "1.6.4",
   "description": "lunar is a calendar library for Solar and Chinese Lunar.",
   "main": "index.js",
   "scripts": {