| Eutrophication of prevention and treatment has become one of the hottest research in the world and the nutriets lead to eutrophication largly are nitrogen and phosphorus, especially the phosphorus, which has become a leading factor which influence eutrophication of lakes. The causes of eutrophication include endogenous and exogenous pollution, As exogenous pollution, which include the point source and non-point source pollution, has been effectively controlled, endogenous pollutions contribute to eutrophication has become a major incentive. Therefor, facing at the chatacters of endogenous phosphorus release, control technology should be effectivly taken into to solve the problem of waters body eutrophication.As the main object of study, The rivers flowwing into the Weishanhu East Lake are studied, also the point source and non-point source pollution. The exogenous pollution impacts on the rivers are analysised. The endogenous pollutions which are based on the on-site analysis and endogenous phosphorus releasing are studied and the methods of phytoremediation technology to solve the pollution of rivers and lakes are raised. The results show that:(1) The pollution source are still the point source in this area, water phosphorus content in Xinxuehe River is the lowest among the three rivers, the average content of TP is 0.03mg/L, the highest content is 0.065mg/L. The quality of Dashahe River and Xiaoshahe River is poor, the average content of TP is 0.121mg/L in the Dashahe River and the highest content is 0.384mg/L. The average content of TP is 0.17mg/L in the Xiaoshahe River and the highest content is 0.35lmg/L.The inorganic phosphorus is the main form phosphorus not only in the sediments but also in the soil along the rivers, which account for 75.54% and 73.49% respectively. The organic phosphorus content, which respectively account to 108.52mg/kg and 114.93mg/kg is high. (2) The endogenous phosphorus releasing mainly occure in less than 15 days, in particular the early and middle periods.The highest releasing content account to 3.31mg/m2·d in the estuary of Xiaoshahe River and the highest releasing content account to 0.52mg/m·d in the lake, compared with 0.41mg/m·d and 0.68mg/m·d in the Dashahe River.In contrast to the endogenous phosphorus releasing from the sediments,the polution attribute to the endogenous phosphorus releasing is less than the polution from people's living. Such as the lake piont by the Xinxuehe River, the highest releasing content account to 35.12mg/m2·d,184 times than the releasing content in the estuary of Xinxuehe River. So, it is essencial to control the polution in the lake with the aim to solve the problem of the endogenous phosphorus releasing. (3)Among several submerged plants, Hydrilla verticillata and Ceratophyllum Demersum remove phosphorus most, followed by Potamogeton, Potamogeton Crispus Linn last. The Typha effecs on the absorption of phosphorus in water was significantly better than the submerged plants.In the aspect of the SRP's controlling, the low and high-density cultivation of Crispus and Ceratophyllum effect obviously better than Herbof Common Corydalis, medium-density cultivation of three plants, effect equally, can maintain SRP a lower level. In the aspect of the TDP's controlling, low and high-density cultivation of Crispus and Ceratophyllum Demersum can well control the level of the TDP; medium-density cultivation of three plants can well control the TDP, Herbof Common Corydalis is the best in the aspect of stability. In the aspect of the TP's controlling, low and high-density Herbof Common Corydalis have the worst effect, in contrast to the other two plants'ordinary effect.
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