Global warming and its impacts have attracted increasing attention from national governments,local communities and scientists. However,uncertainty has been an unavoidable issue in climate change projections when using a single GCM scenario so multiple GCMs projections are commonly used to analyze future climate change. Here,future climate change in the Hai River basin was analyzed using RCP climate scenarios of seven GCMs offered by CMA. Results show that temperature continues to rise over the next 30~50 years,with linear rising ranges of(0.07~0.59)℃ /10a,(0.18~0.45)℃ /10a and(0.33~0.65)℃ /10a under RCP26,RCP45 and RCP85 scenarios respectively. Future precipitation change shows great uncertainty and annual precipitation under the three RCP scenarios is projected to increase by 3.1%,6.8% and 3.4% during 2021-2050 compared to the baseline of 1961-1990. Temperature in winter and spring will increase higher than that in summer and autumn;while the relative change in precipitation in the dry season is much higher than that for the flood season. On the spatial distribution,the rise in temperature tends to increase from south to north,and precipitation change declines from northwest to southeast in general. The likely increase in precipitation may lead to increases in river runoff to some extent. However,with rapid development of the economy and rises in temperature,future water demands may increase and the contradiction between water supply and demand will probably be aggravated. Therefore,construction of a water-saving society and strict water resource management is essential to better adapt to climate change.