The trends and periodic changes of temperature and precipitation processes in the Qinghai Lake periphery are analyzed based on temperature and precipitation data since 1961and combined with wavelet analysis and the El Nino/La Nina events.The effects of the El Nino/La Nina events on temperature,precipitationand droughts and floods are investigated as well.Results showed that the annual precipitation was increasing,most notably in the west,and the annual precipitation was increasing at a speed of 8.73mm/10a.Moreover,the annual temperature was increasing.The mean temperature warming rates were close to or abovethe national average.Bounded by 1987,the average temperature during 1988-2010was significantly higherthan that during 1961-1981.The tests on wavelet periodic changes indicated that the periods of annual precipitation in the Qinghai Lake periphery were about 3,7and 17years and those of annual temperature wereabout 3,7and 29years.The correlations between ENSO events and precipitation and temperature were different in different regions.Floods occurred easily in the El Nino years,while droughts occurred easily in theLa Nina years.The lake level was decreasing,but it has rebounded since 2005.The precipitation had a significant impact on the water level.