Abstract:Mohe is in the most north in China, the clima tic character and change of its extreme low temperature and extreme high tempera ture in 1963-2000 are analyzed by using the correlation coefficient method and c ontrast analysis method. The result shows that Mohe is the coldest place in Chin a, not only creates the record of coldest extreme low temperature, -52.3℃, but a lso the extreme low temperature of every year is below -38℃. The annual extreme high temperature is 38℃. Its annual range of extreme temperature is large, with the lowest of 73.1℃ and the highest of 87℃. In 1980s the annual range of extre me temperature tended to decrease. The overall change in the extreme low temperatu re is not obvious, but in 1990s increased significantly, with an average increase of 1.6℃. The extreme high temperature changes in a flu ctuation way, with an obvious increase of 1.6℃ in 1970 s and decrease of 1.1℃ in 1980s. The annual extreme low temperature occurs in N ovember, December, January and February. The annual extreme high temperature occ urs in May, June, July and August, and most in July. The daily lowest temperatur e occurs at 4:00—7:00, and the daily highest temperature occurs at 14:00—1 6: 00. It is worth to mention that the temperature below zero all happened in the e xtreme low temperature of December-January in the period of 1963-2000.