Like many other papers,this paper uses the ANN to forecast the load.Considering the difference of the marginal increment of generation in each hour,this paper compares the NNLS,NNWLS and NNFWLS method used in the neural network training.The simulation results show that NNFWLS method is not always better than NNLS in each forecasting point. So, this paper brings up a mixed method of combining the NNLS and NNFWLS method to forecast the load in order to gain the best economic result and precision.How to choose...