Three new species,Phyllocoptes angustais sp.nov.infesting Sibiraea angustata(Rehd.)Hand.-Mazz.(Rosaceae),Aculops brevifolis sp.nov.infesting Caragana brevifolia Komn.(Leguminosae),and Diptacus acutifolius sp.nov.infesting Cotoneaster acutifolius Turcz.(Rosaceae),are described and illustrated.All mites are collected from Maixiu National Forest Park,Zeku County,Huangnan Tibetan Autonomous Prefecture,Qinghai Province,China and are vagrant on the undersurfaces of leaves of their host plants.