The sand treatment bed on the market has some problems such as uneven temperature distribution.So heat transfer optimization was carried out through increasing mixing function to enhance the heat convection effect of sand.Based on computational fluid dynamics and moving grid technology, an abstract model of stir heat transfer was established to analyze the specific conditions of sand flow field and temperature field under different heating conditions, and to explore the temperature change law and thermal convection effect of sand body.In order to verify the simulated temperature field results, the experimental scheme was designed and the experimental platform and transmission system were built to complete the experiments under different heating conditions. The results show that heat transfer by agitation can enhance the effect of heat convection and reduce the local heat accumulation; the more densely the stirring shaft is installed in the middle layer of sand body, the better the thermal convection enhancement effect on sand heat transfer is, and the more uniform the temperature field distribution is obtained after heating.