| The JinShan Lake, a sight function shallow lake of ZhenJiang, plays an vital role in the ecological environment construction of the city. In order to protect the lake ecosystem, rationally explore and utilize the lake water resource, it is extremely necessary to mathematically simulate the current water flow and water quality of the lake, to grasp the movement rule of its fluent and water quality. The mathematic model of the lake water environment is an important technique to protect the lake. The model can simulate the hydrodynamic characteristic of the lake and the change rules of the water quality thus provide scientific references for lake water environment protection.In this paper, the Jinshan Lake 2-Demension Water Quantity and Water Quality Coupled Model was established on the basis of jinshan Lake construction projects. Dissociated equations were established by the finite difference method to simulate the two-dimensional hydrodynamic characteristics of the Jinshan Lake under east wind. On the basis of this, the influence of water temperature, nutrients (phosphorus and nitrogen) and velocity on phytoplankton growth, and the change trend of the water quality were simulated.It is concluded by the simulation that as a shallow water lake of the city, the Jinshan Lake flowed its water mainly in the form of wind-droved flow. In the lake, water exchange mainly depends on wind. 25℃is believed the best temperature for the growth of floating algae. So the algae reproduce massively when the water temperature is just at this level between May and August. This confirmed the conclusion that algal bloom generally occurs in summer. Massive nutrition brought by the extraneous source importation becomes the main reason for the worsening of Jinshan lake water quality, especially the no-point source pollution. It is obtained that phosphorus is one of the restrictive factors for algae growth and faster water velocity; intense water disturbance will help the algae growth.
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