Based on Chinese 160 stations monthly mean precipitations data and NCEP/NCAR monthly mean re-analysis data including OLR,500hPa geo-potential height,sea level pressure(SLP) and 850 hPa wind field data，the paper studies the linkage of summer precipitations over Changjiang River valley and tropical convection by means of correlation analysis and component analysis and so on. The results show that there is evidently positive correlation between tropical convection and summer precipitations over Changjiang River valley, that is, when summer tropical convection is stronger (weaker), summer precipitation over Changjiang River valley is less (richer), and then drought (flood) can easily appear. Tropical convective anomaly causes anomaly of mid-low latitude general circulation of atmosphere system , then its anomaly propagates from mid-low latitude to mid-high latitude, and then leads to anomaly of mid-high latitude general circulation of atmosphere system, and they constitute east Asian remote correlation pattern (EAP), thereby, result in summer precipitation anomaly over Changjiang River valley.