Abstract: In order to solve problems of low developing efficiency and reusing granularity of existing information management system of coal equipment which cannot meet personalized demands of coal mine, the paper introduced a component design method of information management system of coal equipment in term of software reuse, gave developing model and structure of the system, and introduced design and implementation of system component in details. The method achieves the purpose of software reuse by creating .NET functional components, reusing basic .NET components and the functional components and assembling the components on .NET development platform. The method improves developing efficiency, reliability and reusability of system software.