The thick salt layer of Kumgeliem Group(E

1-2

km)at the bottom of Cenozoic led to the complicated deformation of post-salt layers in Kuqa Depression.Structural deformation in the study area is studied based on interpretation of seismic data.The types of structural deformation were identified

i.e. contractional structure and salt diapir-related structure.The contrational structures can be divided into thin-skinned folds and thrusts

with salt layer as the detachment.The salt diapir-related structures can be divided into blind piercing diapir structure and piercing diapir structure

which were caused by local thickening and piercing due to salt along-bed flow.The salt diapire-related structures started to develop during the deposition of Jidik Formation(N

1

j)and experienced two evolution stages.The first stage was the Miocene when salt diapir-related was mainly caused by the differential pressure of the overlying strata

while the second stage was the Pliocene and Quaternary when salt diapir-related diaper was mainly caused by horizontal depression.The contractional structures were mainly formed during the deposition of Kuqa Formation(N

2

k)and Xiyu Formation(Q

1

x)

with deformation of decollement folds and development of thrusts on the limbs of folds.