Abstract: In order to improve the reliability of line protection service and ensure the safe and stable operation of power system, this paper studied and analyzed how to effectively control and reduce the risk of line protection service of backbone communication network. Firstly, three types of current line protection channels were introduced, and their advantages and disadvantages were compared and analyzed. Based on the organization principle of reliable fiber optic communication channel, the characteristics of three typical organization modes of line protection channel were analyzed. Combined with the current situation and problems of power optical communication network, the risk factors affecting the operation of line protection were analyzed from the optical cable and equipment. The risk control optimization measures were put forward to provide reference for the risk control of the line protection service of the power backbone communication network.