The present study was carried out from 1986 to 1990. Five different methods were chosen to calculate the biomass of aquatic plants in Gehu Lake. The transect association in whole lake is compared and analysed. The changing pattern of aquatic plants in the lake is discussed in three aspects, also a discussion about their rational utilization is given. An equation for estimating potential fishery production in a densely macrophyte-covered lake is preliminarily proposed. in the last part of the paper, the reasons for the biomass variation of aquatic plants in Gehu Lake are discussed, some suggestions are preliminarily made of the rational utilization of aquatic plants in Gehu Lake.