The changing tends of temperature and precipitation during 20102099 in the Pearl River basin under RCPs scenarios were analyzed. It is based on projections over China simulated by RegCM4 (a high resolution regional climate model), which is driven by the GCM (BCC CSM1.1). The results show that RegCM4 can simulate local climate distribution characteristics over the Pearl River Basin quite well, judging from comparisons of the simulation with in situ observation. For the future, the projected temperature shows a persistently increasing trend in the Pearl River Basin under RCPS scenarios. Compared to the reference period (19801999), the average temperature in 2020s will increase 0.7 ℃ and 0.8 ℃ under RCP4.5 and RCP8.5 Scenario, and increase 1 ℃ and 1.6 ℃ in 2050s, and 1.6 ℃ and 2.9 ℃ in 2080s. There is no significant change trend in the annual precipitation, but the projected precipitation has different change trends for different scenarios and areas. Under the RCP4.5 scenario, the precipitation will reduce by 4.3% in 2020s while increasing by 0.7% and 0.1% in 2050s and 2080s, respectively. Under the RCP8.5 scenario, precipitation shows a decreasing trend, with 1.7%, 2.9%, and 0.2% in 2020s, 2050s and 2080s, respectively. It indicates that the precipitation has greater uncertainty. Under the two emission scenarios, there would be an increasing trend of precipitation in the southeast coast while a decreasing trend in the northwest in the next 90 years. Meanwhile, the frequency distribution of daily temperature indicates that the potential possibility of high temperature event might rise. And a substantial increase of the extreme precipitation events is also projected and may lead to increased frequency of flood events.