On the basis of core accurate description,as well as date of well logging and seismic attribute data ,analysis of the study area rock types, sedimentary structure and tectonics, sedimentary sequences, etc ,combined with regional settlement context, it is believed that the study area is on a flood plain development meandering river depositional system.And it can be found that four types of sedimentary facies,including the bed phase、 bank phase、river flood phase and oxbow lake. Under the premise of understanding phase, combining with the connecting well sedimentary facies sectional in North and South and the flat sedimentary facies,considering that the sedimentary environment evolution of Kuqa group from the botteom to the top is from the riverbed subfacies of low water level,through the embankment subfacies of high water level,to the floodplain of higher water level,