In order to investigate the climate change in the Mahai Basin of the Qinghai-Tibet Plateau under the conditions of global warming,the variations of annual precipitation and temperature data in the Mahai Basin were analyzed using the accumulative anomaly method,Mann-Kendall test,and wavelet analysis.The results suggested that(1)annual precipitation is stable from 1970 to 2010 while annual temperature has an increasing trend;(2)annual precipitation has a decreasing trend before 2001 and increases after that,while annual temperature has a decreasing trend before 1995 and increases after that;(3)the primary oscillation periods of annual precipitation are 15 and 30 years while the primary oscillation period of annual temperature is 26 years; and(4)annual precipitation has different dry-wet cycles while annual temperature has different hot-cold cycles under different time scales.The variations of precipitation and temperature are different under different time scales,and the variations are lower when the time scale is smaller.