According to the problems that there exist keywords ambiguity in information searching and mining and the classification of quering information has a certain ambiguity, a kind of information mining method based on fuzzy classification networks is proposed in this paper. This method uses the fuzzy classification network’s intrinsic non-linear processing ability and self-adaptation learning mechanism for fuzzy information, the information Classifier and mining model based on fuzzy classification network is built by learning many classification document information from WEB pages, the structure of information classification model constructed is simple, learning convergence speed is rapid and easily implemented. The classification strategy and implementing algorithm is given in this paper, and the method’s validity is proved by the subject information classification of China oil and gas pipeline.