Abstract: In view of the problems of Huanjiang area,such as high waterflooding control degree,complicated remaining oil distribution and great tapping difficulty,by taking full consideration of sedimentary regularity of sand body in braided river reservoir,the reservoir internal architecture was studied.Based on reservoir architecture division scheme that advised by Miall in early years,level-5 classification scheme of reservoir architecture for braided river was proposed.Combined with coring and logging data,the sand bodies of braided channel and beach dam were identified and classified.At the same time,the space combination style and superimposed relationship were discussed.In the end,8 kinds of remaining oil enrichment patterns corresponding to different configuration unit combinations were proposed.Therefore,the theory of clastic rock reservoir architecture in Huanjiang area was deepened,which provided a good guidance for secondary development in the study area.