By using the high-resolution sequence stratigraphy theory,through depositional dynamic analysis,the cores of 25 wells and 596 well logging data, Gaotaizi reservoir of the Western Area of Placanticline in Songliao basin is divided as 1 long-term base level cycle,5 medium-term base level cycles,13 short-term base level cycle,proposed bottom flaw non-base flaw sequence formation new framework with the sedimentary structure lifting control in the north and west of Gaotaizi reservoir. Fine study of sedimentary characteristics identifies two types of special high-quality sandstone reservoir,beach bar of shore-shallow lacustrine and fluxoturbidite fan,reveals that the most favorable facies sandbody is thin channel-mouth bar、sheet sanbody、beach bar and fluxoturbidite fan,in the northern half of the study area a large number of broad thick favorable submarine river sandbody is not oily, water-bearing zone for a large area.Though the study and summary,it is realized that a variety of types of lithologic reservoirs developed in this area, for example: sand lens reservoir, dumping pinch-out reservoir, fault - lithologic reservoirs and integrated reservoirs,sandbody development and distribution of lithologic reservoirs are controlled obviously by sedimentary facies.This shows that “facies controlling” theory has once again been an excellent application and deepening in the study area.