Abstract: Species composition, density and biomass of pla nktonic rotifers were investigated at nine stations in the Baoan Lake, Hubei Pro vince in 1996, which were compared with the results of other authors in 1986—1987 and 1992—1993. The author analyze the species succession and change tendencie s of density and biomass of planktonic rotifers in the Baoan Lake within decade f rom the angle of rotifers, the author discussed the problems of rational explora tion and utilize of the macrophyte lakes.