There are problems of single aspect and subjective proportion in existing power optical transmission network evaluation methods. Thus this paper proposes a power optical transmission network running state evaluation method. First, the indices are selected from the three dimensions of equipment, cable and system, and an evaluation index system is established from the three aspects of network scale, running quality and management factors. The overlapping information analysis method is designed to optimize the evaluation index system. Second, the subjective and objective combination weight assignment method based on an interval fuzzy analytic hierarchy process and entropy weight method is improved to calculate the index weight. Then a running state evaluation algorithm based on a fuzzy comprehensive evaluation, utility function, extension coupling evaluation and combination evaluation methods is designed to evaluate the running state of the network. Through the analysis of real examples, it is verified that this method can evaluate the running state of an optical transmission network more comprehensively and objectively, identify the weak links, and provide a reference for operation, maintenance and planning construction.