Abstract: He 2 member is the main target zone of Dongsheng gas field and it belongs to braided river sedimentary environment,with local multiphase rivers mutually superposed and crisscrossed,quickly changed horizontal sand body,large area and lower degree of well control.Therefore,it is difficult to accurately analyze sedimentary sand body distribution regularity by relying on single method.With use of the data of core,logging,reservoir prediction,etc,combined with the geological understanding,the characteristics of sedimentary facies have been analyzed.Through the analysis of the characteristics of seismic reflection strength properties,with macro control,the characteristics of seismic facies and sand body distribution have been made clear.By referring to the contemporary braided river sedimentary model and the drilled well drilling,the distribution characteristics of the sedimentary facies have been ultimately determined.And therefore,the well site deployment has been carried out by use of this research results.