June ' s precipitation has good relation not only to march ' s potential geographical high on 500hpa , but also to january ' s potential geographical high on 70hpa and 50hpa , july ' s precipitation has distinct statistical relation not only to december ' s potential geographical high of last year on 500hpa , but also to june ' s potential geographical high on 70hpa and 50hpa , and august ' s precipitation are good correlation with the variation of february ' s potential geographical high on 500hpa and march ' s on 70hpa and 50hpa 6月份降水量同500hpa前期3月份,平流层中下层( 70hpa 、 50hpa )前期1月份位势高度场变化相关最明显; 7月平均降水量与前一年12月500hpa以及当年前期6月70hpa , 50hpa高度场相关较好; 8月区域平均降水量与前期2月500hpa以及前期3月70hpa , 50hpa高度场相关最好。