Based on the access logs of network users, Feature Weighting Naive Bayes Classification(FWNBC) algorithm is used to identify users. Firstly, the data acquisition system based on WinPcap framework was used to collect the access logs of network users, characteristics are counted from five aspects by analyzing these access logs, and then selected after filtering, at last the FWNBC algorithm is used to identify the 3300 samples, and the recognition rate reached 85.73%.The experiment results show that this algorithm is effective to identify the identity of network users.