Through the outcrops and core observation of the Dengying Formation in the Southeast Sichuan and Northwest Guizhou, it is considered that the upper dolomite of Dengying Formation had developmented a series of paleokarst identification, including karst breccias, karst caves and cracks filled, limonite weathering crust, and so on. Based on previous research on the upper Yangtze Tongwan movement, the parallel unconformity between Cambrian and Ediacaran was formed by movement of Episode III and Episode II in most areas. Moldic thickness methods are comprehensively used to restore the karst paleogeomorphy of Tongwan movement Episode III, the moldic thickness include Niutitang Formation, Mingxinsi Formation and Jindingshan Formation, barring Maidiping Formation. Which has obvious diachronism. According to the instructions of moldic thickness and ancient landform, it is indicate that, karst palaeogeomorphology distributed from north to south, the East part was high, the West part was low. Karst highland was developed in the East part, karst depression was developed in the West part, and Karst Slope was developed in the Central part. Which can be furtherly divided into secondary karst palaeogeomorphology units, such as monadnock, platform and upper slope, lower slope.