Abstract: An investigation was conducted on the species diversity of epiphytic bryophytes in Baihua Mountain National Nature Reserve, Beijing in 2004-2010. A total of 495 specimens were recorded, belonging to 34 species, 21 genera, and 13 families, among which, Pottiaceae, Leskeaceae, Entodontaceae, Orthotrichaceae, and Hypnaceae were the dominant families, and Lindbergia sinensis, Pylaisiella polyantha, L. brachyptera, and Frullania musicicola were the dominant species. There were three peaks of the vertical distribution of the epiphytic bryophytes, i.e., altitude <1200 m (14 species), altitude 1400-1500 m (11 species), and altitude >1700 m (10 species), and only 5 species were distributed at altitude 1200-1300 m. Shannon index was the highest for Betula platyphylla (1.816) and the smallest for Juglans mandshurica (1:500), Pielou evenness index was the highest for Populus davidiana (0.910) and the smallest for Q. liaotungensis (0.591), Simpson index was the highest for Q. liaotungensis (0.335) and the smallest for P. davidiana (0.181), and Patrick index was the highest for Q. liaotungensis (13) and the smallest for P. davidiana and J. mandshurica (7). The species diversity indices of the epiphytic bryophytes were related to habitat, bark crack, and water availability.