According to the information of total 110sites of mean temperature,mean maximum temperature, mean minimum temperature and accumulated temperature during the rice growing period from 1961 to 2013in rice area of Sichuan,the paper analyzes the characteristics of heat changes during the rice growing period.The results showed that the heat conditions of the growth period were on the rise.For the trend of temperature,the highest mean amplitude and the most percentage of stations show that a warming trend was the mean maximum temperature,the second was the mean minimum temperature,and the lowest one was the mean temperature.For the interdecadal variability,the climate elements increased during the 1980swhile compared to the 1970s,but for the 1970sto the 1960s,most of the climate elements were decreased except for mean minimum temperature that temperature-rising and temperature-falling area and amplitude almost kept invariability.Based on the EOF method,this paper built the representative time series of heat conditions and analyzed the cyclic variation in whole.Representatively,the mean temperature and the mean maximum temperature during the growing period have a 2~3ashort cycle and a 14amid cycle as well as an about 24along cycle.The mean minimum temperature and accumulation temperature share the fluctuation periods of 2~3a,6~7a,14aand 24a.