Abstract: Immediately drying is very important when rapeseed harvest encounter rainy weather in southern China. To grasp drying characteristics of rapeseed and the optimum drying working parameters is of great significance to develop new type of high efficiency and energy saving rapeseed drying equipments. In this paper, based on the principle of total weight measurement, a experimental device was developed, real-time control of parameters and data acquisition in the process of drying were realized as well. The device was applied to the research of rapeseed drying characteristics. The single factor and multi factor experiments were carried out in order to improve the precipitation rate and reduce the unit energy consumption by Using the medium temperature, average penetrate wind speed and tempering time as the main influencing factors of drying characteristics. Results indicate that the method of studying drying characteristics of rapeseed based on total weight measurement has the advantages of intuitive results, accurate measurement and good data continuity. And the optimum drying working parameters were obtained medium temperature is 75℃, average penetrate wind speed is 0.358 m/s, the tempering time is 30 minutes.