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With the aggrandizement scale of software systems, its complexity increased significantly.Practice shows that the master degree about the overall structure of the software systems and integral operation process, directly affecting the accurate measurement of software system complexity.The theory of complex networks recently studied has offered a new perspective on solving the problem.Meanwhile, as the use case diagram is start from the system overall perspective and overall operating process that describe the executive and the system to provide the connection between the cases to execute relations, puts forward the complex network characteristics metrics method of software system based on use case diagram and complex network theory, and gives a specific metrics process and algorithm.Finally, the algorithm is verified by example.