Abstract: The ancient architectures were often suffered by thunder strike because of their special structure features.Based on the structure features and thunder prevention deficiency of ancient architectures,the categories and the design plans of thunder prevention in the ancient architectures were discussed in Xingcheng,Liaoning province.The set of technical parameters including arrester and down lead as well as ground connection was brought forward.And the strategy to prevent the side strike thunder and ball thunder was put forward.The optimal plan was discussed in terms of the current status of ancient town and thunder strike characteristics.