Based on the superiority of artificial neural network (ANN) in identification of non-linear system,according to parameters of automobile,dynamic performance and fuel economy gained by experiment,evaluation criterion of(system) identification accuracy is analyzed.Furthermore,initial weights,initial biases and nodes of BP ANN has two(layers) are gained.Then,performance database of automobile is established.This model can realize forward prediction and backward reasoning,and it can decrease the development cycle of automobile.At last,validation is carried out by means of example.