Abstract:A new method based on probabilistic neutral network ( PNN) is proposed to identify the fault of bus. Firstly,the software of PSCAD/EMTDC is used to simulate the state of the fault bus,and the data is abstracted and preprocessed. Then amodel of PNN is established. Sequentially,the accuracy of bus fault identification based on PNN can be verified by discriminatingall kinds of bus faults correctly after training.