The intelligent network services are implemented by some software entities of SLP(service logic processing) which is a chain of SIBs(service independent building bIocks)on the architecture of IN(intelligent network)．In order to ease the introduction of the IN services rapidly and cost effectively，this paper proposes a set of methods of soft- ware reuse in the CIN-01 IN system． In the system，a reusable software design for every SLP iS presented. SLPs are constructed from reusable components——SIBs and CCB，and reusable patterns——SLR，SIBSSDs and CCBAPPEND.