To understand the species and occurrence of stored grain insects and mites in Beijing and Tianjin which is the fourth grain storage ecological area, and to provide the basis for formulating pest control strategies, field investigation of stored grain insects and mites was carried out in grain related places in 2016 and 2017. A total of 19 species of stored grain insects and 3 species of stored grain mites were collected in Beijing. The main occurrence species were Sitophilus zeamais (Motschulsky), Sitotroga cerealella (Olivier), Tribolium castaneum (Herbst), and Plodia interpunctella (Hübner). A total of 22 species of stored grain insects and 4 species of stored grain mites were collected in Tianjin. The main occurrence species were Sitophilus zeamais (Motschulsky), Tribolium castaneum (Herbst), Oryzaephilus surinamensis (Linnaeus), and Tenebrio obscurus Fabricius.