The wavelet translation method has been used to analyze the temperature changing trend of Hangzhou in summer since 1951. the results show that there exist four shifts in the trend. Every shift tends to accompany with the summer temperature violent surge. There is an obvious shift in 1978—1981 and there are more violent surge since 1980s. By reason of global climatic change, the temperature changing cycle will be more fickle, the changing trend will be more instable.