Abstract
Authors have been developing computational software for the life-cycle design of structures through utilization Genetic Algorithm. Present paper proposes application examples of the actual building in planning phase as a step for practice use. For practice use, calculation and setting method for numerical model as well as design parameters have been improved. The obtained results can be considered reasonable showing useful knowledge about structure in solution space. The two-step usage method of software on the basis of the knowledge is proposed, which can be said much more suitable for practical use.