Salt played very important roles both in the deformations of the Kuqa depression and Dongpu depression in the Cenozoic. It is of tectonic significance tocomparethe roles of salt in different properties of deformations. Salt tectonics in the Kuqa depression, associated with the distribution of the salt-bearing Paleogene Kumugeliemu Group, mainly formed in the west of the depression. They were resulted from compressive tectonic stressescaused by the collision between the Indian plate and Eurasian platein the Cenozoic. The salt structuresinclude salt-cored detachment folds, detachment faults, salt-related basins and salt welds. Salt tectonics in the Dongpu depression, associated with the distribution of the salt-bearing Member 3 of the Paleogene Shahejie Formation, mainly formed in the north of the depression. They resulted from the extensional tectonic stressescaused by the subduction of the Pacific plate beneaththe Eurasian platein the Cenozoic. The salt structuresinclude forced folds, detachment faults, salt-related basins and salt welds. Although the salt tectonics in the two depressions isdifferent in the deformation properties, the roles of salt in deformations aremostly identical to be detachmentplanes, and the flow mechanisms of salt were similarto be caused by tectonic factors.