Abstract: Power control system for wind farm is a key link in tracking grid dispatching instruction and controlling wind turbines. In order to optimize the power control system for wind farm, and to reduce mechanical loss of wind turbine in control process, the operational mechanical characteristics of wind turbines is considered in this paper, and a comprehensive evaluation system is proposed. Then the index weights are determined by using AHP corrected by the entropy weight method, and turbines are assessed by fuzzy comprehensive evaluation. In the end, a reducing power optimization model is proposed. The effectiveness of proposed evaluation strategy and optimization model is verified by actual wind farm example.