Based on the research and survey in Boyan, Boyan's physical defense is studied from three levels including the group layout, the organization and the detail structures of the traditional architecture.The study also discusses three material defensive psychology:the contrast between internal and external, feeling anxious under monitoring and self-suggestion.The study points out the defensive system of traditional architecture constitute with physical defense and material defensive.The defense characteristics is affected by Chinese traditional culture and business group culture, so it carries its regional features.The scientificity of the defensive system of traditional architecture is meaningful to the safety planning and designing for the contemporary architecture.