Wheat was loaded into granary for storage right after being heated in order to prevent pests, which is one of the frequently used methods in farmers. But at present the key factors of the method is unclear. The experiment of loading heated wheat in vat to check the effect of the method was carried out in a farmer in Henan province. The result showed: wheat was loaded into a vat after being heated could effectively kill maize weevil eggs and larvae, but little impact on wheat quality indicators. Monitoring data showed that oxygen concentration was almost constant and the wheat temperature was on the high side and continued for a period of time. Therefore, temperature is the main factor by the method.