With the deepening reform of electric power system in China, the commonly used security constrained economic dispatching model cannot meet the calculation period requirement of open and impartial dispatching, and in order to overcome the influence of electric power direct trading on open and impartial dispatching, a two-stage optimization model for annual rolling generation scheduling with the consideration of open and impartial dispatching is proposed. In the first stage, the optimal rolling unit commitment model considering the direct trading and open and impartial dispatching is built, which optimizes unit commitment and power generation schedule in the annual residual period. In the second stage, the generation scheduling optimization model considering the balance of daily load rate of power plant is built to avoid the rapid change of average daily load rate. The simulative results of a practical provincial power grid verify the correctness of the proposed model and the effectiveness of the proposed method.