It seems that each of factories and buildings has such an established construction system that efficiency of work order in each field has been pursued. However, it may be considered that the system has not taken the effect of the assembly sequences on the schedule into account sufficiently. In this paper, a relation between an assembly point and a schedule is examined using a genetic algorithm and a schema analysis, and the effect on the schedule is considered. A new computer aided system enables us to extract some rules from a ship building process will be developed.