Abstract: Owing to the complexity and the uncertainty of risk factors of electric power communication network，as well as the fuzziness of data，it has given the risk evaluation method of the electric power communication network based on tolerant rough-fuzzy set after analyzing the problem.The risk evaluation model of the electric power transmission network has established，and after analyzing the actual data using this method，the possibilities of each tolerant class belonging to the different decision-making class are determined and objective risk evaluation rules are obtained.The results indicate that this method is effective and feasible，and it has certain guiding sense to the risk management.