Based on the core observation, drilling and seismic data, the sedimentary characteristics and the distribution of sedimentary facies and sedimentary evolution of Huoshiling sequence were studied. The results show that the overlying volcanic rocks widely developed in nearly whole region are member 2 of Huoshiling Formation, and member 1 of Huoshiling Formation can be divided into five level 4 sequences. Delta facies and lake facies are the mainly sedimentary facies in Huoshiling Formation.