Shuanglong Lake is a shallow lake in the urban city, which has been a typical eutrophic lake. After synthesizing harnessing and control of outside pollutions, the endogenesis pollutions caused by polluted sediment may become the main nutritional burden of the lake. As for this, it is important to ascertain the releasing principles of nitrogen, which is the restrict nutrition factor of the lake. It can rehabilitate and maintain water quality of the Shuanglong lake, provide that the scientific foundation for harnessing the lake and protecting the environment. This paper had reported the investigation of nitrogen release from sediment of lake, and marked environmental factors include temperature,dissolvable oxygen, pH and hydrodynamic power, the releasing model can be obtained: r=12.931+0.103[T]－0.36[pH]－0.728[DO]+0.490[K], which can be applied to analyzing and estimating nitrogen released from polluted sediment, and control the release by raising the level of dissolvable oxygen in the lake.