At present, China has built various types of grain storage warehouses, including standard grain storage warehouses and non-standard warehouses. Due to the variety of warehouse types and materials used, the grain storage effect is different under the action of solar radiation, temperature conduction inside and outside the warehouse, thermal convection between pores in the grain bulk, and other conditions. In order to achieve the purpose of safe grain storage, the grain storage industry has formulated the judgment standard of grain storage mode and realized the hierarchical management of safe grain storage, while transformed the defects of grain storage hardware into the exploration of grain storage theory. Based on the theory of temperature field distribution, the grain storage patterns of the horizontal warehouse with different heat preservation measures and the circular warehouse with different types were tested and analyzed by routine test and densified test points. We proposed to cancel the index of “average grain temperature”in judgment of grain storage mode, to use“the highest temperature of certain part”as the only index for judgment of grain storage mode, and classify the granary into 4 grades. Granary with the highest temperature exceeding 30 ℃ was not suggested to be used as a grain storage warehouse. This suggestion can improve the grain storage conditions from the source, so that the grain storage warehouse type in China can be improved as a whole, and both the symptoms and the root causes can be solved.