Abstract: To master the internal damage of ancient architecture wood members,based on the field investigation,the damage characteristics and damaged parts of the ancient architecture wood members were analyzed.By taking the reverse test of elm specimen by the FAKOPP stress wave,the stress wave under different empty size,hollow shape and wave velocity attenuation of digital collection were studied.Resultsshow that the hole constantly expands,the error value constantly decreases between test area and actual area.And the minimum error is 4%.In addition,there is significant linear relationship between T and S.FAKOPP stress wave on hole shape recognition is weak.By using the systematic thinking a comprehensive analysis of two-dimensional plane detection figure was conducted,and the V_a,V_b,V_c,V_d and V_c wave velocity line diagram was reflected.The research provides reference for determining the shape of inner the hole area and hole shape,and the most stable path of wave velocity is V_c.When the empty hole was half of the cross section area,the attenuation of wave velocity of complete specimen comparatively reached 51.16%.The research results are useful to the preventive protection of ancient buildings,and can provide effective data support for practical engineering repair and reinforcement of buildings because the research adopted the detective method of quantitative analysis instead of qualitative analysis.