Abstract: During 1983-1992, species compositions of aquatic insects were ihvestigated in the upper reaches of Songhua, Yalu,Tumen and Mudan rivers.These rivers all arise in Changbai Mountain in China. More than ten thousand specimens were collected,and 166 species found belong to 7 orders, 40 families,86 genera.The characteristics of ecological habits and faunal compositions were analysed.