Abstract:The defense system of Longtian residence can be divided into three layers from the outside to the inside: the first layer is huzhaihe and Waizhai wall; the second layer is turret, watchtower, peripheral house wall, horse corridor, gate structure, etc., which are the most important defense carriers; the third layer is an internal closed courtyard with complete and independent production and living system. In addition to the form of material defense, Hakka people's inherent psychological demands for self-protection and survival are also diffracted in their later folk culture, reflecting one of the most important spiritual core of Hakka culture.