This paper analyzes the issue of multi-fault location in optical networks by using the fuzzy clustering theory and builds up its fuzzy clustering model.Then it performs fault location on the basis of the expert system obtained from the fuzzy clustering algorithm and the membership function formula between alerts and faults thus determined.Finally

it performs multi-fault location simulation experiments in optical mesh network topology and obtains the comparison charts of success rate in fault location and time performance.The experimental results show that the fuzzy clustering algorithm can locate faults fast and efficiently.