Abstract: The Cretaceous sedimentary facies belt distribution is an important factor to determine reservoir distribution characteristics.Through analysis of seismic facies,core description,drilling,well logging and seismic data,combined with sedimentary background of Junggar basin,it is believed there are three types of sedimentary facies in Chunguang exploration area,namely,shore-shallow lacustrine,fan delta and braided river delta.In combination with tectonic evolution process of Chepaizi uplift,the characteristics of cretaceous sedimentary evolution is determined.Through the research on the controlling effect of sedimentary facies on trap development,the formation overlap zone is the favorable zones in trap development,and deltaic front subaqueous distributary channel and the shore shallow lacustrine beach-bar sand were clearly considered to be the favorable exploration facies belt.