Abstract: The Qianjiang Depression is located in the central part of Jianghan Basin with Tankou oilfield close to the Qianbei fault. Through exploration and exploitation, it is found that the formation thickness varies greatly in a short distance with poor lateral continuity and narrow distribution range between sand bodies according to the logging, drilling and production performance data. As the salt rocks are well developed in the area, the types of a series of salt structures including salt bed detachment zone, detachment fault, salt dome and salt diapir structures are analyzed based on the seismic section and development of salt bed. The genetic mechanism of salt structures in the area is dominated by strike-slip. According to the salt structure types, the genetic mechanism can be recognized as salt bed detachment, uplift and diapirism. The evolution of salt structure is divided into three stages:the incubation period of salt structure in Jingsha Formation, the formation period of salt structure in Eq⁴-Eq³ of Qianjiang Formation, and the finalization period of salt structure in Eq²-Jinghezhen Formation. The development of salt rocks and formation of salt structures lead to the poor lateral continuity of target sand body and small distribution range of oil layer, thus exerting an effect on the oil-gas accumulation.