Huanglong Formation in eastern Sichuan is the major stratum of natural gas exploration and development.But sedimentary facies research in this formation is weak,it has become a factor which restricts the sequential natural gas exploration.Based on drilling core description,field profile actual measurement,slice identify,and combine the feature of sedimentary facies in petrology, palaeobiology, well logging, Huanglong Formation has been ploted? as three types of sedimentary system,including sabkha, barrier coast and continental shelf, , the sea level heighten gradually, area onlap forward the ancient land and expansile transgression sequence, according to the feature of sedimentary, Huanglong formation can be recognized as 8 subfacies and 13 microfacies, the characteristic of karst landform in Huanglong Formation, which has been impact by Yunnan Movement,is discussed. Based on the plot of sedimentary facies and karst landform, the lithofacies-palaeogeography map of Huanglong Formation each section and karst physiognomy,and it’s relationship with reservoir growth are described.