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Distributed middleware can reduce the development cycle of distributed application system, and provide a good development environment and transparent support for distributed application. Developing the fault-tolerant distributed application platform based on middleware, it not only greatly simplifies the development of the fault-tolerant distributed system itself, but also improves the flexibility, scalability and reliability of distributed application, and is easier to deploy and manage the fault-tolerant system. From this perspective, we have designed and implemented a fault-tolerant platform based on active replication by using CORBA. Comparing the result in different systems, we know the middle tier is the bottleneck of the platform performance.