The interannual variations both of total summer rainfall days and rainfall days with different class intervals over eastern China are analyzed by using the daily precipitation data in China during 1958—2004.The results show that the number of total summer rainy days and rainfall days with different rainfall amount over eastern China in the period of 1980—2004 was obviously different from that in the period of 1958—1979. The total rainfall days and total precipitation amount decreased after 1980 in Northeast China, due to the reduction in light rainy days. The total rainfall days and total rainfall amount also decreased after1980 in North China, the former is attributed to the reduction in the rainfall days with every class interval, especially in light rainy days, and the total precipitation amount reduced due to the decrease of the rainstorm days. In the Yangtze River valley region the rainy days and precipitation amount increased after 1980, as the total rainfall days increased with the increase of rain days for moderate rain and heavier, but total precipitation increased mainly because of increase of rainstorm days. In south China the rainfall days and precipitation amount reduced after 1980, the latter is due to the decrease of rainfall amount in every rainfall class, while the reduction of the rainy days is associated with the decrease of light rainy days.