By using the high temperature data of 35 meteorological observation stations in Chongqing from 1960 to 2006, the spatiotemporal variation features of high temperature day (HTD) are studied. The results show that there are four regions with more HTD in Chongqing. The largest values of general, serious and special serious HTD are 21d/a, 14d/a and 2d/a respectively. The HTD occurs mainly in Jul y and August, and there are much more HTDs in August than in July. In the recent 47 years, the HTD has an evolutional trend of increasingdecreasingincreasi ng and the variation tendency of serious HTD is especially obvious.