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For the long-term full-load and high-intensity operation of large transonic wind tunnel, constructing the automation platform is an important means to meet the heavy maintenance requirements. Based on the existing office integrated management IS, the maintenance automation platform based on B/S architecture, distributed database and hierarchical design strategy is designed. Through combing and optimizing the maintenance workflow and management process, the main function modules of the platform as maintenance specification, maintenance plan, maintenance warning, fault record, maintenance approval, maintenance acceptance. Through internal and external data interface, information of different systems is shared, automatic data transmission is realized, and human resources are saved. The operation shows that the platform has stable performance, reasonable interface, good scalability and maintainability.