一斗口跳在中国古代建筑的斗拱中是结构较为简单的一种,是斗拱出跳的简洁形式。《营造法式》卷四“大木作制度”对四至八铺作的各类斗拱结构作了较为详细的规定,唯对斗口跳和把首绞项作两项未曾涉及,卷三十和三十一“大木作图样”中也同样缺如。因此,斗口跳拱的具体作法在《法式》中并不明了。但在卷十七“大木作功限”中规定了“斗口跳每缝用拱斗等数: “科口跳每柱头外出跳一朵用拱斗等下项泥道拱一只华拱头一只栌头一只交互斗一只散斗二只闇栔二条” A bucket jump in the ancient Chinese architecture in the brackets is a relatively simple structure, is the concise form of jumping out of brackets. “Build the French” Volume IV “system for a large wooden” for four to eight shops for all types of arch structure made more detailed provisions, only the bucket jump and the first twisted items for two did not involve the volume thirty and thirty A “big wood for the pattern” is also missing. Therefore, the specific practice of jumping over arches in the “French” is not clear. However, in the volume seventeen “big wood as the power limit” provides that “the bucket jump every seam with the number of arches:” Koukou jumping out of each stigma with a bucket and other items under the mud arch a Chinese arch Only a head to fight a battered two dark 栔 two "