Abstract:On the basis of field investigation and specimen observation, and information of SEM leaf epidermal micromorphology, the taxonomic revision of Cotoneaster microphyllus Wall.ex Lindl.was carried out. As a result, fifteen specific names belonging to three series(Series Procumbens Klotz;Series Alpigeni和Series Marginati Klotz),are reduced to be synonyms of C.microphyllus Wall. ex Lindl.