Abstract: A set of morphology descriptors of debris is presented to describe the micro feature of wear particles, and the program to auto identify wear particles by means of artificial neural network (ANN) technique is compiled. During training the network, the fuzzified factor based training technique given out in this paper is used, and the training process is accelerated rapidly. When the network is used to identify the wear particles, the identifying accuracy is higher than 90%, and the identifying speed is very fast. The method by far excels the traditional ones.