The sedimentary characteristics of the Qingshankou Formation of Upper Cretaceous in Binbei area of Central Depression in Songliao Basin were systematically analyzed， based on studies of core and welllog facies. The planar distribution of sedimentary facies of different members of Qingshankou Formation and facies evolution were studied in detail， according to the single factor analysis and multifactor comprehensive mapping method. Maps of single factors and sedimentary facies of different members of Qingshankou Formation have been compiled. The results show that during the deposition of Qingshankou Formation，mainly two types of sedimentary facies: delta  and lacustrine facies， including four subfacies， ie. delta plain， delta front， shoreshallow lacustrine and semideep-deep lacustrine facies were developed. In the study area， from the margin to the center， the facies changed from delta plain， gradually to delta front， shoreshallow lacustrine and semideep-deep lacustrine facies， from bottom to top， the facies gradually changed from semideep-deep lacustrine to shoreshallow lacustrine facies， delta front， delta plain facies. The evolution process of the Qingshankou Formation can be divided into three stages based on the distribution character，including the early， middle and late stages. The sedimentary characteristics are diffe￣rent in different stages and different tectonic units. While， as a whole， the lacustrine basin is characterized by changing from large scale to small scale from the early stage to late stage.