This paper describes the development of SIMS. SIMS provides not only the basic functions, such as input and output of outside plant maps and facility status statistics report, which are the major function of TOMS, but also can manage outside plant facilities and subscriber information integrately to maximize the efficiency of large outside plant facility database and to increase the qualify of subscriber service. SIMS provides following functions: Work order generation for telephone installation; Automatic cable pair assignment; Cable tracing and unused pair management; Subscriber record management and statistics report generation; Subscriber address information management.