山西口泉断裂是一条规模大，活动期长的大断裂，它构成了云岗断坳与桑干河新裂陷的构造单元界限，同时又是大同侏罗纪煤田的东部边界，一般认为，这一大型基底断裂的形成和演化对煤田地质构造的发育具有重要的控制作用。本文对这一构造的形成机制和演化历史进行了分析研究，阐述了口泉断裂和青磁窑断层对大同侏罗纪煤田地质构造的展布规律和构造特征的控制关系。 The Shanxikouquan fault is a large-scale and long-term active large fault that constitutes the tectonic boundary between the Yungang fault depression and the Sangganhe new rift and the east boundary of the Datong Jurassic coalfield. Generally speaking, The formation and evolution of this large basement fault play an important role in controlling the geological structure of coalfields. In this paper, the forming mechanism and evolution history of this structure are analyzed and studied, and the relation between the spring break and the Qingziyao fault on the distribution and tectonic features of the geological structure of the Datong Jurassic coalfield is expounded.