Abstract: West Slope of Xihu Sag has entered the exploration stage of lithologic traps with the development of exploration. The main exploration strata of Eocene Series in West Slope experienced a period of strong fault subsidence-depression transition. The fault-lithologic traps related to faults are the main types of lithologic traps. In order to find the rich areas of large-scale lithologic oil and gas reservoirs, it is necessary to recognize the formation conditions of fault-lithologic traps. In this paper, through the study of the tectonic sedimentary evolution of fault-lithologic traps and the combination of sand control models, it is considered that various types of sand bodies such as delta branch channels, tidal flat sands and tidal channels are developed in the sedimentary environment of tidal flat and tide-dominate delta intergrowth, which is formed for the reason that the slope belt with the geomorphic background of low eastern part and high western part caused the provenance to advance from west to east. Four types of fault-lithologic traps are formed under the control of faults and landforms, those are traps of the up dip pinch out zone of sandstone on the downthrown side slope of the consequent main fault and the block zone from the flank of the fault, traps of the up dip block of the downthrown side of the multilevel consequent fault and the pinch out zone of sandstone on the flank, traps of the up dip pinch out zone of sandstone on the downthrown side of the antithetic fault and the block zone from the flank of the fault, and traps of the up dip block of the upthrown side of the antithetic fault and the pinch out zone of sandstone on the flank.