To study the factors affecting ihe nutrient release of Bellamya sp.,laboratory simulation ex peri ments were carried out,and other traits of Bellamya sp. such as the effects of Bellamya spp. on suspended substance in (he water column, water transparency and phytoplank Ion in the system were also investigated. Results showed iliat temperature and ihe amount of food had great influence on nutrient release of Bellamya sp. At 15T1, the release rales of ammonia nitrogen and phosphate phosphorus by Bellamya spp. were 55.60 (± 4. 95) μg/(g?d) and 2.073 (±0.1203) μg/(g?d), respectively; at 25T1,the release rale of phosphate phosphorus was about 2.819 (±0.075) μg/(g?d). So ihe release rale of nutrient increased al an enhanced temperature,meanwhile nutrient release rate of snail eating food was higher than it that eating nothing. Bellamya sp. could increase the transparency of water on a short lerm, but the release of nulrienls increased the contents of nitrogen and phosphorus in waler, which in turn accelerated the regeneralion of phytoplankton. Bellamya sp. can not control the production of algae completely,bul iheir improving the secchi-disk deplh of water is helpful for the growth and resloration of submerged macrophyles. Il is suggested that the combination of biomanipulation of snails and restoration of submerged macm-phyles will be an important technical way lo conlrol the eutrophication and improve water environmenl.