Abstract: The study of braided river reservoir configuration has penetrated into the interbeds within mid?channel bar, so the characterization of the bar that controls the configuration of interbeds has been more highlighted. In this paper, the identification of the braided river zone boundary was conducted, and then the distribution of the mid?channel bar and braided river channel was analyzed, based on the outcrop and modern deposits, as well as well pattern data of Yangsanmu oilfield, and the method and procedures of the configuration factors and plane combination of reservoir in such a sandy braided river mid?channel bar was presented. Using this method, the distribution of the mid?channel bar in target zone was predicted, and verified rationality by real drilling tracks in several horizontal wells in 2011. It is helpful for horizontal well design and arrangement in this oilfield