Abstract: To better develop the application and research on wind power forecasting, this paper summarizes, unscrambles, and concludes the existing technologies of wind power forecasting by tracking a mainline of point forecasting, interval forecasting, probability forecasting and scenario forecasting. Firstly, the difficulties of wind power forecasting are analyzed, and the classifications of the wind power forecasting are categorized according to different time scales, forecasting forms, forecasting objectives and forecasting models. In addition, the current model, theory and method of wind power forecasting are described based on different classification. Then, the main wind power forecasting software and systems at home and abroad are discussed, and the evaluation criteria and indexes of the prediction error for wind power forecasting are summarized. In the end, the development trends of wind power forecasting in future are discussed. The research work of this paper will provide comprehensive reference information for the development of wind power forecasting and the application of wind power forecasting system.