This paper analyzes the types of sedimentary facies of Lower Cretaceous Series and their distribution and evolution in Yingen Basin according to detailed survey and analysis of a lot of field geological sections around the basin. The Lower Cretaceous series of Yingen Basin are typical interior lacustrine basin deposits, which developed over 2000 meters of sandstone, conglomerate, mudstone, carbonate rocks, neutral to basic volcanic rocks and a little oil shale and evaporite. The types of sedimentary facies include alluvial fan, stream (mainly braided stream), fan-delta, delta and lacustrine facies. Regional structural movements mainly controlled the sedimentary systems and their distribution and evolution. The sedimentary facies evolution can be approximately divided into three stages that reflect a full sedimentary cycle of a faulted basin from formation, development to shrinkage. The early phase of Early Cretaceous Period was initial fault depression stage of the basin; the middle phase of Early Cretaceous Period was intense fault depression stage and the late phase of Early Cretaceous Period was fault depression shrinkage stage. Each stage developed special sedimentary facies and facies assemblage.