Abstract: In order to study the characteristics of variable-temperature hot-air drying of rice and improve the efficiency of rice drying, a self-made homogeneous drying device test bed was used to conduct constant temperature and variable temperature drying experiments on rice, and the analysis of constant temperature, rapid stepped heating, slow stepped heating, and continuousDrying characteristics of rice drying and slow-supply drying. The test results show that the rice drying time is shortened as the drying temperature increases with the constant temperature drying method of rice. Adopting variable temperature drying method, heating the rice first and then lowering the temperature, setting the slow-relief stage and other processes can effectively shorten the net drying time and increase the drying rate. The drying effect of rice is mainly affected by temperature and time. The effect of constant temperature and variable temperature on the drying rate of rice is discussed.