Abstract:Detrended canonical correspondence analysis (DDCA)and detrended correspondence analysis(DCA) were applied to study the relationships of the main epiphytic bryophytes and the environmental factors in 36 sites in the forest ecosystems in Changbai Mountains The results showed that host species, place on trunks, canopy density, altitude, inclination angle and the direction of the host trunks are the five important factors influencing the distribution of epiphytic bryophytes