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<i>Cheyletus malaccensis</i> Oudemans and <i>Cheyletus eruditus</i> (Schrank) are predators of stored-grain pests in China. The psocid <i>Liposcelis bostrychophila</i> Badonnel is prone to outbreaks in depots. To assess the potential of large-scale breeding with <i>Acarus siro</i> Linnaeus and the biological control potential of <i>C. malaccensis</i> and <i>C. eruditus</i> against <i>L. bostrychophila</i>, we determined the development times of different stages at 16, 20, 24, and 28 °C and 75% relative humidity (RH) while feeding on <i>A. siro,</i> as well as the functional responses of both species’ protonymphs and females to <i>L. bostrychophila</i> eggs at 28 °C and 75% RH. <i>Cheyletus malaccensis</i> had a shorter development time and longer adult survival time than <i>C. eruditus</i> at 28 °C and 75% RH and could establish populations faster than <i>C. eruditus</i> while preying on <i>A. siro</i>. The protonymphs of both species showed a type II functional response, while the females showed a type III functional response. <i>Cheyletus malaccensis</i> showed a higher predation ability than <i>C. eruditus</i>, and the females of both species had a higher predation ability than the protonymphs. Based on the observed development times, adult survival times, and predation efficiency, <i>Cheyletus malaccensis</i> has much greater biocontrol potential than <i>C. eruditus</i>.