Taking into account wind power output prediction error and load forecast error reducing along with the timescales shortening, as well as spinning reserve capacity of the power system configuration inseparable from unit commitment, this paper establishes a mathematical model of power system spinning reserve configuration for unit commitment in multiple time scales. Priority method is used to solve the startup and shutdown sequence of each unit, then the PSO is used to solve the most economical scheduling corresponding to different equivalent spinning reserve capacity. On the condition that the reliability of the system can meet the requirements, by use of continuously updated information of wind power output prediction and load forecast to adjust the scheduling plan, it reduces the configuration of power system spinning reserve capacity and improves power system economic operation with wind power grid connected and absorptive capacity of wind power.