Abstract: Defects in the wood have serious impact on the load carrying capacity and safety of wood members. To screen the defects and their size of ancient architecture quickly and efficiently is always an important problem demanding effective solutions. This article puts forward a set of methods, on which the defects in cylindrical ancient architecture wood members and their size can be screened quickly without bringing any unnecessary damages. Results show that Fakopp and resistance can be used to detect the defects in cylindrical wood members of ancient architecture.