The spatial seesaw structures and climate features of April to September precipitation in east China are studied month by month and season by season in this paper,and the results show that the position and intensity of the seesaw were different in different periods.The seesaw feature of precipitation between south and north areas were more obviously when the time scale became large.The index of southern-drought(flood)-northern-flood(drought) is defined as the difference of the normalized anomaly of rainfall between south and north areas,and the index from 1951 to 2003 calculated.The difference t test of typical southern-drought(flood)-northern-flood(drought) years of summer and August precipitation confirms that the drought/flood years we have identified are reasonable.The secular trend and interdecadal variations of the seesaw features of precipitation during 1951—2003,and its relation with the cold/warm events are also studied.The results show that cold/warm events had effect on the large scale precipitation seesaw in June,June to July and summer.There were more droughts in north area and floods in south area when warm events happened,and vice versa.Study also points out that the cold/warm event is only one of factors that determine the distribution of precipitation over East China.