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In order to improve the maintainability and extendibility of systems, a bus-type approach of component composition based on component composition's principle and software architecture was proposed. In the bus-type approach, system is decomposed into different components, which communicate with each other through a message bus. The approach can make the components transparent to each other, so as to add, delete or replace a component. The approach is applied to develop EAM (Enterprise Asset Management) system. It shows that the approach can improve the maintainability and extendibility of EAM system significantly.