For monitoring and controlling stored grain pests in grain storage, the tropism of natural activity of seven main stored grain pests were studied under laboratory conditions. The results showed that the Triboliumcastaneum (Herbst), Liposcelisbostrychophila Bodonnel and Sitophilusoryzae (linnaeus) showed strong tendency towards east and north when the light source was at the east and north, the Triboliumconfusum Jacquelin du Val towards north, and the Sitophiluszeamais Motschulsky towards east. The Liposcelisbostrychophila Bodonnel obviously trends to north when there is no light source. The results of the study can provide a reference for the field monitoring and trapping.