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A study is conducted of the characteristics of climatic change at Tianchi in the Tianshan Mountains， based on the climatic statistic data of the Tianchi station in the Tianshan Mountains from 1959 to 2007， by means of the linear trend estimation， power spectrum analysis， the moving〖WTBX〗 t〖WTBZ〗 test techniques， and anomaly standard deviation contrastive analysis.The results indicate that climatic change at Tianchi had obvious multirange oscillation characteristic， and possessed obvious annual change; a sudden change of air temperature occurred around 1996， but there was no such a sudden change in precipitation.Air temperature and precipitation changes were in agreement with the warmwet change pattern in the mountainous areas of the Tianshan Mountains.The minimum temperature increase contributed most greatly to the warming of Tianchi， and the most obvious humidity increase trend appeared in spring and winter; summer precipitation kept unchanged but the rainy days decreased. Extreme weather such as severe precipitation increased in summer.