Abstract: According to the 1961—2017, last frost in the early period and Tongcheng city air temperature and other meteorological data, using mathematical statistics method, the temperature and the stability of the Tongcheng city by 0 and 10 ℃ agricultural resources, and last frost in the early period of the heat change characteristics and regularity of response to climate change were analysised. The results showed that the climate of Tongcheng area generally presented a weak warming trend, and the climate of winter and spring was obviously warming, while the summer and autumn seasons showed a cooling trend, and there were three warm periods and two warm and cool periods. Agricultural heat resource was more and more rich, 0 ℃ or higher in the early days and 10 ℃ or higher average daily showed a trend of small early, but after 1997, there was an obvious delay; 0 and 10 ℃ or more between the initial and ending days of continuous days all showed a trend of extending, prolonging significantly after 2011; Although the cumulative temperature of activity increased in general, it tended to decrease before the mid-1980s and increase after that, especially since 2011. The frost-free period increased significantly, and the frost-free period increased to 264.6 days in 2011—2017.

Key words: Tongcheng city, heat resources, climate change, response