Rolled H-section steel product standarded by JIS or ISO are useful for reusable members. These members are prepared for standard specification concerning about beam to beam, beam to column connections etc.. This paper discusses selection method and applying condition for reusable members using linear programing, and also simulates applying reusable members of low storied steel frame structures to those of new building steel structures using a database modeling. Then, evaluate application ratio and use for reusable members of building steel structures.