Abstract: Bryophytes are distributed in patches on the floor of primary coniferous forests in the Eastern Tibetan Plateau, but the patch character has received little attention. We investigated the Synusia biomass of major bryophyte patches — Actinothuidium hookeri, Thuidium cymbifolium, Pleurozium schreberi, Hylocomium splendens, Actinothuidium thuidium in a coniferious forest of the upper dadu River and measured environmental indices (air temperature, air humidity, sun intensity, substrate humidity, etc.) for each patch. The analysis of patch biomass and environmental factors indicated significant correlation between bryophyte biomass and air temperature, air humidity, sun intensity, scrub cover and herb cover, with the level of impact varying. A finite factor had a different influence on the finite patches, and the ecological function is a result of all factors participating together. The characteristics of bryophyte biomass resulted from comprehensive functions of all the environmental factors.