Abstract: The spatial distribution of the annual and seasonal precipitation is consistent with the spatial distribution of the wet days in corresponding phases;the changing trend of annual rainfall appears in the distribution pattern of “+、-、+”from northeast to southwest,and it is more notable that there is positive trend in West China and the delta of Changjiang River and negative trend in North China and western Sichuan province;The changing trend of seasonal precipitation field in spring,summer and autumn is very difficult to describe,except that most areas have positive trends of winter precipitation field;The negative trend of annual wet days appears in most areas of China,notable negative trends of wet days occur in autumn;it is on average from 0 to 11 days with the intensity of heavy precipitation,the maximum value situates on the western part of Southwest China,the minimum value situates in southern XinJinag;there is notable correlation between the annual rainfall field and the anomaly of global temperature,meanwhile the correlation is also notable between the annual wet day field and the anomaly of global temperature,but the reliability of the latter is more than that of the former.