Abstract:The niche overlaps of 42 moss species in 41 sites in the main ecological systems in Changbai Mountains were calculated by Wang‘s equation.Two\|dimensional scatter plot of principal axes analysis(PAA),systematic cluster tree and the minimal spanning tree on the basis of niche overlaps were drawn,which revealed the ecological similarity of 42 moss species.The combinative application of principal axes analysis,systematic cluster analysis and minimal spanning tree method on the basis of niche overlaps could exp...