The present study was carried out in the laboratory of the Economic Entomology Department and the crop farm of the Faculty of Agriculture, Kafr El-Sheikh University. Its aim was to survey mite species in five agricultural bi-products, and they were: wheat straw (Triticum aestivum L.), clover hay (Trifolium alexandrinum L.) rice straw (Oryza sativa L.), faba bean (Vicia faba L.) and dry sugar beet pulp (Beta vulgaris L.). The diversity in the recorded species and families was calculated according to Shanon-Weaner diversity index. Results revealed in recording 34 mite species belonging to 22 families and 4 sub-orders. Actinedida (46.82%) was represented by 20 spp. of 10 families; Gamasida (10.06%) by 6 spp. of 6 families; Acaridida (42.15%) by 6 spp. of 4 families, and Oribatida (0.97%) by 2 spp. of 2 families. On the other hand, it was found that the family Acaridae was represented by (37.71%) of the recorded mites, and was considered to be dominant; Cheyletidae by (17.26%) and Tydeidae the same by (15.00%), and were the predominant families. Tarsonemidae (6.37%), Nanorchestidae (2.35%), Stigmaeidae (2.74%), Ascidae (3.99%), Phytoseiidae (2.62%), Laelapidae (2.8%) and Chrotglyphidae (3.67%) were third in rank, while Siteroptidae (0.48%), Bdellidae (0.72%), Cunaxidae (0.63%), Eupodidae (0.07%), Pideculochelidae (0.77%), Pachylaelapidae (0.28%), Halolaelapidae (0.02%), Ameroseiidae (0.34%), Glycyphogidae (0.11%), Pyroglyphidae (0.75%) Ctenacaridae (0.09%) and Cosmochthonidae (0.87%) were fourth in rank and were considered to be rare families. Results also indicate that the relation abundance of the recorded species in each stored material had an effect on the diversity index values and the recorded values supported each suggestion.