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The reconfiguration router unit (RRU) is one of the most effective solutions to improve router function extend. It can satisfy the urgent need of multi-network and multi-business. Component composition and compositional reasoning are the core technologies and frontier research areas in RRU. In the process of component composition, resource-control of router is the most important factor. How to detect the resource of router and reconfiguration the router by the router limit is an important research field. Based on the characteristics of RRU and software components and inspired by software component reusing, component composition algorithm is proposed in this paper to integrate software components simply and conveniently. In the algorithm, the reconfiguration process is divide into three grade: business reconfiguration, modual composition, component composition. Moreover, based on the using environment of the router, this paper take an example as change Ipv6 router to Ipv4 router.