Based on the concept of the life cycle, this paper integrates static data (e.g. the initial design information of the bridge), and dynamic data (e.g. manual inspection, maintenance records, and real-time monitoring data) to conduct a comprehensive evaluation of cable-stayed bridges from four dimensions of the civil structure includes electromechanical system, ancillary facilities, and operational services, and proposes multi-dimensional evaluation indexes, evaluation process, and calculation methods. Given the shortcomings of the single architecture of the traditional bridge evaluation system, for instance, high system coupling, poor error isolation, and poor scalability, based on the.NET microservice framework, the paper designs and realizes the online comprehensive evaluation system of the cable-stayed bridge by using C# language, middleware technology, and MySQL database. Through the application verification of a cable-stayed bridge in Shanghai, the results show that the evaluation method and system can meet the business needs of bridge evaluation, which can effectively help operating enterprises carry out maintenance analysis.