Abstract: Firstly, the basic concepts of the 10 reduction algorithm and the classification of classical rough set theory is introduced, the structure scheme design process based on classical method of rough set reduction is given; Secondly, according to high-rise structure example, the structural design method is given based on classical rough set reduction algorithm, it develops a new approach and method for the structure intelligent design. Practice shows that comparing with the traditional methods to treat the inaccuracy problem, it has the advantages the traditional method does not have to use rough set to solve the structural design problems with uncertain information processing.