The accurate evaluation of the wind speed and wind power forecast for a wind farm can effectively promote the forecasting accurate levels and reduce the adverse effects of the wind power on the power network. This paper makes a comprehensive review of forecast accuracy evaluation methods of the wind speed and the wind power for wind farms, and it is shown that the forecast accuracy evaluation methods fall into four categories, the common mathematical prediction accuracy evaluation method, the forecast error percentage method relative to the wind farm rating, the grade forecast accuracy evaluation method and the method closely integrated with the wind power generation characteristics. These accuracy evaluation methods are analyzed with respect to the characteristics, the extent and the scope, related with the wind power generation characteristics.