The Shaximiao Formation in Hexingchang-Fenggu area at the middle part of western Sichuan Depression attained a high degree of attention because of its large scale delta deposition and large exploration potential, but the sediment source and facies is unclear. The rock types and structural features, heavy mineral assemblage, well logging and seismic facies of Shaximiao Formation were analyzed. The result shows that the sedimentary source of Shaximiao Formation is located at the northeast of the study area. Subaqueous distributary channel and interdistributary bay are the dominant sedimentary microfacies, and subaqueous distributary channel is the favorable sedimentary facies. The research results provide basic geologic data for the oil and gas exploration in this area.