The development of renewable energy is of great significance to the adjustment of China's energy structure. This paper takes the dispatching operation method of wind power system as the research object, constructs the electricity price response model of controllable load, cost function and wind power output probability density function, and studies short-term wind power output. The forecasting method considers the randomness of controllable load and wind power output into the dispatching system of the power grid, and proposes a method for economic dispatching of wind power system.