Abstract: The Qiulitag anticline zone locates in the front of the Kuqa fold?and?thrust belt，southern Tianshan Mountain. We study the structural characters and deformation mechanisms of middle segment of Qiulitag anticline zone based on several cross sections，which integrate surface geology，seismic reflection depth profiles and well log data. There are three decollements(Jurassic coal bed，Paleocene?Eocene Kumugeliemu Fm. salt and Miocene Jidike Fm. Salt)distribute in Kuqa，which displacements varing regularly laterally in the middle segment of Qiulitag anticline zone. The displacements of the faults developped by Jidike Fm. Salt and Jurassic coal bed decrease to west，while the displacement of the fault developped by Kumugeliemu Fm is inverse. The folding styles of middle segment of Qiulitag anticline zone is controlled by the distributing area of the three decollements and their displacements. The eastern Kuchetow anticline is a detachment fold cored by Miocene Jidike Fm. Salt，which overlying a deep fault?bend fold，the fault?bend fold have a lower decollement flat located in Jurassic coal bed. The western Southern Qiulitag anticline is a detachment fold cored by Paleocene?Eocene Kumugeliemu Fm. salt. Kuchetow anticline plunge to west，Southern Qiulitag anticline plunge to east，so the two antclines plunge with their underlying faults individually. As a result，as(1)the eastern part and western part of Qiulitag anticline zone involved in deformed strara，(2)the displacements of the three decollements converge and transform，and(3)Kuchetow anticline，Southern Qiulitag anticline and Tuokelaketan anticline converge in middle segment of Qiulitag anticline zone，so the deformation of middle segment of Qiulitag anticline zone is complex. Based on study results，a 3?D model is proposed to illustrate the deformed mechanism of middle segment of Qiulitag anticline zone.