Abstract: The repairing principle problems of old building structures are discussed. The wind tunnel tests were carried out on 1:100 scale wooden tower model by selecting two wind speeds and two cases (window opened and closed), from which the octal wind pressure coefficient were derived. Consequently, the engineering physical property, mechanical property by specimen analyses, standard infiltrating tests and calm force touching surveying tests are obtained. The foundation composition and delamination composition of the tower courtyard foundation by resistivity tomography with surface electrode arrays are explored and attained. There are various diseases in Yungang Grottoes, including water harming, cracks and collapses of rock, the breeze causing and pollution of the environment. Thusly, a long-term research work is needed for the prevention and cure. The pingyao ancient city wall is a combination wall of the soil and brick. For the long age, there are collapsing affairs usually by nature and artificial hurting. In order to do the research, the wall-body breaking characteristics are gotten by computing several typical wall models.