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Support vector machines (SVM) has been used in load forecasting field. The noise and redundancy of sample data are important factors to the generalized performance of SVM. They can cause some disadvantages of slow convergence speed and low forecasting accuracy. A SVM forecasting method for short-term load forecasting based on rough sets (RS-SVM) is developed in this paper, using rough sets algorithm to preprocess historical load data, and both processing speed and forecasting accuracy will be improved. At last, this model is applied to short-term load forecasting, and compared with the method of SVM and BP neural networks it manifests better performance and better forecasting accuracy.