在贵阳乌当断层南北两侧，下石炭统九架炉组、祥摆组和旧司组的分布和沉积特征存在明显的变化，九架炉组仅分布于乌当断层北西侧，祥摆组由北向南的沉积环境由泻湖相向浅海相呈有规律的变化，旧司组则仅在乌当断层南侧分布。这些地层的分布规律、沉积环境的变化说明了乌当断层为黔中隆起南侧边缘断层，且该断层自早古生代形成后，晚古生代仍有活动。 There are obvious changes in the distribution and sedimentary characteristics of the Lower Carboniferous 9-Member Furnace Group, the Xiang-Pei-Group and the Old Silurian Formation on the north and south sides of the Wudang Fault in Guiyang. The 9-Member Group is only distributed on the north west side of the Wudang Fault, The depositional environment from north to south in the group varies regularly from the shallow lacustrine facies to the shallow lacustrine sea, while the older division is distributed only on the south side of the Wudang fault. The distribution of these strata and the change of depositional environment indicate that the Wudan fault is the southern margin of the central Guizhou uplift. After the formation of the Early Paleozoic, the fault still has activity in the Late Paleozoic.