Objective To investigate Acaroid mites breeding in storage circumstance. Methods Each sample was sieved and detected acaroid mites with the methods of microscopic examination and Tullgren to extract mites. Results 26 species of acaroid mites were identified from 60 kinds of stored materials, which belonged to 19 genera, 7 families, including Acarus, Tyrophagus, Tyrolichus, Mycetoglyphus, Aleuroglyphus, Caloglyphus, Thyreophagus, Suidasia, Rhizoglyphus, Lardoglyphus, Glycyphagus, Lepidoglyphus, Austroglycyphagus, Blomia, Chortoglyphus, Carpoglyphus, Histiostoma, Euroglyphus and Dermatophagoides. The total breeding rate of 600 samples was 83.2%. The density was significantly different. In the samples in which acaroid mites were detected the breeding density ranged from 2.7 NO•g^(-1) to 326.3 NO•g^(-1) Conclusion Acaroid mites breeding in the stored materials belong to Acardida. More attention should be paid to acaroid mites breeding in storage circumstance.