Liang Dingyi et al. (2002&) proposed that a ground fissure cropped out in the Baishi Mountain Geological Park, Laiyuan County, belonging to the northern segment of the Taihang Mountain. And the ground fissure formed at the same time when the Wumishan formation deposited in Middle Proterozoic and filled by seismically collapsed breccias, including soft-sediment deformation structures. However, this idea is likely controversial.Methods: In this paper, we restudy the “fissure” by carefully field survey and propose its formation mechanism based on the structural evolution history of the Northern Taihang Mountain. Furthermore, another structural evolution model is suggested.Results: Field work ground fissure; seismite; fault breccias; Baishi Mountain