The Chemo palaeouplift is located in the interior of the Junggar Basin. It is oriented in SWNE direction which was formed in the Yanshanian Orogeny. Now it is a monocline with a north to south inclination. The Jurassic of the study area experienced a multistage tectonic movements. Many truncations and onlap unconformity surfaces were developed, thus the study area is profitable for exploration of lithologic petroleum accumulations. By analyses on the eroded stratigraphic thickness and according to the seismic profiles characters, the eroded thickness of the Toutunhe, the Xishanyao and the Sangonghe formations of the Jurassic in the Chemo palaeouplift are reconstructed using the direct seismic profile indexing method combined with the thickness viriation ratio method and the neighboring thickness ratio method. The most intensive erosion occurred in the KuitunMosuowan area, and the largest eroded thickness is 260 m, 340 m, and 140 m respectively for the three formations. The eroded thickness of the Xishanyao Formation in the high palaeouplift was probably formed by twostage tectonic movements, while the eroded thickness of the Sangonghe Formation in the higher palaeouplift was probably from the tectonic movement in the later period. The relationship between the planar distribution characters of the eroded thickness and the formation and evolution of the palaeouplift indicate the late Early Jurassic is the initial forming period of the Chemo palaeouplift, the sedimentary period of Xishanyao Formation is its developing period, and the Late Jurassic is its extensively developing period. The transportation of a great deal of eroded sediment provided the conditions for the lithologic trap formation on the slope area of the palaeouplift. The southern slope area of the Chemo palaeouplift is the profitable petroleum accumulation area.