Daily meteorological data from 1961 to 2006 of Chongqing area have been employed to diagnose the impact of climate changes on hightemperature,drought and flood disasters of Chongqing. Results show that significant warming of Chongqing area began at late 1990s. The abrupt temperature change occurred in 1997. During warming period, extreme high temperature event increased obviously, the risk of heat wave rose significantly, meanwhile extreme precipitation event also increased obviously, the risk of flood rose significantly. Furthermore, the trends of each grade regional average precipitation days have been analyzed, the precipitation days of light and moderate rain decrease obviously, which may lead to the risk of drought to increase significantly. Put regional temperature anomalies into two parts, one is the impact of global climate changes on it, the other is regional selfvariability. It was found that the contribution of global climate changes to regional temperature variations increased significantly during warming period. Then we calculated the contributions of global climate changes and regional selfvariability in 2006, respectively, results suggest that global climate changes and regional selfvariability may cause the abnormal high temperature of 2006, but regional self-variability is the main contributor.