In this paper, the methodology and efficiencies of recovering phosphorus from three aquatic plants, Trapa natans L., Potamogeton maackianus, and Egeria densa, were discussed. By soaking the dry powdered biomass tissue in distilled water for 24 hours, 50 to 81% of phosphorus was extracted into the liquid phase. More than 89% of the extracted phosphorus was precipitated as calcium phosphate although it was concerned the precipitation is inhibited due to phytic acid, a chelating agent, and various organic substances. Overall phosphorus recovery ratios were 41~76%.