Environment temperature is the key factor to cause stored grain pests. The pests adapt to the temperature in medium and high temperature grain storage ecoregion in China, in which pest damage is serious. In order to guide integrated pest management, 19 grain depots located in the medium and high temperature grain storage ecoregion were randomly selected to carry out the investigation on the grain stored insect species by trapping technology with corrugated board. The results showed that eighteen kinds of main grain pests were found. There was little difference in insect species between medium and high temperature region, species of external-feeding pests were much higher than that of internal-feeding pests. The temperature and humidity of both medium and high temperature area were suitable for the development of pests，and the pests species in medium temperature area was slightly higher than that in high temperature area.