Based on the daily minimum temperature data of 275 stations in China during 1955—2006, the spatial and temporal features and variation trends of the extreme minimum temperature are studied. Results show that the frequency of the extreme minimum temperature decrease all over China with the significantly decreased mutation taking place in 1983. The most significantly reduced trend locates in North China, and the middle-lower reaches of Yangtze River and its south regions, and the least significant one lies in the Hetao area. The reduced trend is weak in Sichuan Basin and Yunnan-Guizhou Plateau regions. The regional spatial differences of the extreme minimum temperature events are significant, and the abrupt change years of the extreme minimum temperature frequency are inconsistent in different regions, in such a way that there are obvious differences before and after the mutation. During the recent years, the extreme minimum temperature variations tend to be steady in different regions.