Abstract: The energy saving service industry is developing rapidly and this paper discusses the choices for enterprise energy-saving because the government sets a threshold value about energy saving and adopts the subsidy policy to encourage enterprises to save energy. Given the scenario of subsidies, a profit-maximizing model and a Stackelberg game model were set respectively to determine the optimal energy saving and the benefit-sharing proportion. The effects of the choice of energy saving under different subsidies were analyzed. The results indicate that, considering the government's subsidies, the company will change the original energy-saving way, and tend to choose outsourcing to save energy, which is conducive to the development of energy-saving service industry.