By survey of filed geological section and many of core and analysis of well-log ging data and microfacies in the microscope, we think that formation of Kangcun  group in Neogene period in area of Dawanqi，Tarim basin are a delta sedimentary  system which form where a lowsinuosity river flew into an in-land lake with ver y shallow water. The sand bodies are made of lithical sandstone with different size. Delta place subfacies and delta front subfacies has been distinguish in the  range of oil fields, they were subdivided into 8 kinds of microfacies. Reservoi r sand body mainly consist of distributary channel sand，subaqueous distributary  channel sand and distributary mouth bar sand．They are vertically characterized  by multiple superimposition and laterally by frequent migration, tapering out a nd lower continuity.