Chinese ancient architecture is a significant embranchment of Chinese civilization, whose exquisite construction technology and unique architectural aesthetic value has made profound influence on ancient buildings in surrounding countries. The protection of wooden architectures, the most Chinese style building because of its long civilized history and extensive distribution, is becoming more and more urgent accompanying the passing of time. Understanding and grasping the structural dynamic characteristics of the building has had great significance to its maintenance and protection. In order to collect dynamic response data under the condition of on damage to structural performance with tested ancient architecture, the pure wood structural building Feiyun pavilion which is a representative sample of Chinese ancient wood structure was carried on the dynamic test employing environment excitation. Modal parameters such as natural frequencies, damping solved by the Stochastic Subspace Identification (SSI) method combining the Random Decrement Technique (RDT) can offer references to protect this ancient building.