The multi-time scale structure and localization characters of Qiqihar's temperature variation are analyzed by Morlet wavelet transformation. The results show that there are not only quasi-biennial,4-year,4-6-year and 8-year annual scale periodic change and 40-60-year decades scale periodic change,but also marked abrupt change characters in Qiqihar's temperature variation. The 40-60-year scale periodic alteration of coldness and hotness occurs in 1924,1955 and 1989.