目的　探讨正常牙合成人牙弓容量与颅面结构的关系。方法　对 90名上海地区正常牙合成人牙牙合模型、X线头颅后前位片和侧位片进行线距测量分析。结果　下尖牙间宽度对上下牙弓的影响最大。上下牙弓容量不仅与颅面部宽度和深度有关 ,还与垂直向的生长密切相关。同时建立了上海地区成人X线头影测量Coben分析法的正常值范围。结论　颅、牙合、面的生长是三维的 ,在宽度、深度和高度上互相协调、制约和补偿。 Objective To investigate the relationship between dental arch capacity and craniofacial structure in normal occlusion. Methods Ninety normal occlusion models of human dental occlusion, X-ray anteroposterior and lateral radiographs in Shanghai area were measured. Results The width of the lower canine had the greatest effect on the upper and lower dental arch. Upper and lower dental arch capacity not only with the craniofacial width and depth, but also with the vertical growth are closely related. At the same time, the normal range of Coben analysis of adult X-ray in Shanghai was established. Conclusions The cranial, occlusal and facial growth are three-dimensional, which are coordinated, restrained and compensated in width, depth and height.