Abstract: The Gaoshiti-Moxi area has been a favorable karst landform after the deposition of the Dengying Formation. However, influenced by complex tectonic movement and obvious differential erosion in the study area, it is unable to effectively indicate favorable reservoirs using traditional paleogeomorphology restoration technologies. On the basis of summarizing the advantages and disadvantages and applicability of traditional paleogeomorphology restoration technologies such as the residual thickness method and the impression method, new paleogeomorphology restoration technology, the impression method + residual thickness method, is proposed by taking the Deng 4 karst reservoir as a case. After mapping a new sedimentary paleogeomorphology, and comprehensively analyzing the sedimentary paleogeomorphology, favorable reservoir facies belts are divided in the Deng 4 Member. The results show that the sedimentary paleogeomorphology map obtained from the new method can eliminate the thickness variation caused by denudation to a certain extent, so original sedimentary thickness could be characterized more realistically. The overlaps on the bottom of the Deng 3 Member and the paleogeomorphology of the Deng 2 Member restored by the residual thickness method proved that, in Well MX47, the Deng 4 Member was in deep water when it began to deposit, resulting in poor reservoir physical properties and low tested production. The most favorable reservoir facies belt is the stripped shoal facies on the platform margin in the western part of the study area. In the eastern part of the study area, there are restricted platform facies where the reservoir properties are the worst.