The predation of Cheyletus eruditus(Acari :Cheyletidae)on Tyrophagus putrescentiae (Acari:Acaridae)has been studied at five constant temputures. The results showed that all the functional response of Cheyletus eruditus on Tyrophagus putrescentiae were the Holling Ⅱ functional response. The adult female Cheyletus eruditus was the most efficient predatory stage, followed by the adult male and protonymph .The predator's density affected its preying ratio and the preying ratio decreased with the increasing pred...