Taking the environment system of Jinjie Industrial Park as object, this paper builds its system dynamics model based on structural analysis and chooses six adjustment parameters for simulation, including investment proportion of production (sctzl), investment proportion of science and technology(kjtzl), investment proportion of environment protection(hbztzl), investment ratio of waste water treatment(wstzl), investment ratio of waste gas treatment (scltzb) and investment ratio of solid waste treatment (gfcltzl). The simulation results show that, when sctzl is changed from 0.14 to 016, kjtzl from 0.02 to 0.04, hbztzl from 0.04 to 0.08, wstzl from 0.4 to 0.36, scltzb from 0.2 to 0.34 and gfcltzl from 04 to 0.3, the average growth rate of the parks gross industry production per year will be 21%, the average decrease rate of relative environment pollution degree per year 8.1%, and the average growth rate of population per year 4.7%, which means the system reaches its optimal state. Therefore, at least two important measures of environment management should be taken by JinJie Industry Park. One is to properly decrease production investment proportion and to increase investment proportion of science and technology and environment protection; and the other is to reasonably adjust investment ratio of waste water, gas and solid waste for strengthening relative infrastructure construction, which can be the foundation of collection and treatment system of the “three wastes”.