Based on the 1956—2005 summer daily precipitation of 147 Chinese stations supplied by the National Meteorological Information Center，features of the summer rainfall have investigated in the Yangtze-huaihe river basin, features of atmospheric circulation and sea surface temperature (SST) have been studied based on 850 hPa wind of NCEP/ NCAR reanalysis datasets and ERSST data. Results show that consistent anomalous distribution character is the main mode of the June-July rainfall in the Yangtze-huaihe river basin. The June-July rainfall in the Yangtze-huaihe river basin, in the long-term, exhibits a significant increasing trend and possesses a leading character of inter-annual oscillation in the past 50 a. There are good relationships between June-July rainfall in the Yangtze-huaihe river basin and the SST in the adjacent ocean of China as well as the 850 hPa wind in both preceding spring and corresponding summer.