Abstract: The preferential power generation system is an important guarantee to implement the national strategies, but there are still many challenges in its implementation in the process of electricity market reform. Based on the analysis of the relevant policies, the main problems under electricity market environment are analyzed, the relevant market-oriented implementation modes are discussed, and an implementation scheme for preferential generation in the market-oriented environment is proposed. It is concluded that: according to current relevant policies, the preferential power generation system mainly includes five types of power generation, but in actual practices, many problems are faced such as the imbalance of power generation and consumption, the imbalance of revenue and expenditure and the occupation of market trading space, so the market-oriented implementation needs a systematic market mechanism composed of multiple market types, trading varieties, deviations and settlement mechanisms; under current policy and market environment, we propose a basic implementation scheme, which is composed of six main steps, including determination of differential power plan, implementation of market-oriented implementation, and so on, and at the same time an allocation method for differentiated electricity plan is also designed. The proposed scheme has good adaptability for development of electricity market, and has been applied in Beijing-Tianjin-Tangshan power grid.