Abstract: The structural condition assessment of ancient pagoda based on ambient vibration test (AVT) is an important part of its preventive protection work. Combined with the AVT method, a method to identify the stiffness center of the ancient pagoda is proposed based on the linear structural model in this paper. Based on the dynamic theory of eccentric structure, the calculation model and characteristic equation of the non-coaxial stiffness eccentric ancient pagoda are condensed. The derivation of the linear structure identification model based on Bayesian theory and Gibbs sampling are used to identify the physical parameters of the structure. The identification results are verified by combining with classical examples. The method is then finally applied to the identification of the stiffness center of the Kaiyuan Temple Pagoda, a key cultural relic in China.