Based on drilling and regional tectonic data, the sedimentary distribution characteristics of pre-accumulated oolitic shoal of Feixianguan Formation in Kaijiang-Liangping trough are studied in detail, and it is concluded that the sedimentary evolution characteristics and sea level change play a controlling role in the distribution characteristics of pre-accumulated oolitic shoal in Kaijiang-Liangping trough during the sedimentary period of Feixianguan Formation.The lithology of oolitic shoal is light gray bright crystalline oolitic limestone, which is mainly developed at the top of the first member of Feixianguan Formation and the middle and upper part of the second member of Feixianguan Formation.The pre-accumulated oolitic shoal is mainly located in Jiange-Jiulongshan area during the sedimentary period of the first member of Feixianguan Formation,while it is located in Yuanba-Pingchang area during the sedimentary period of the second member of Feixianguan Formation. The oolitic shoal has the characteristics of rapid thickness change in the lateral direction and multi-layer stacking in the longitudinal direction.This discovery provides a new exploration area for the oil and gas discovery of Feixianguan Formation and has important resource exploration significance.