Due to the influence of geological structure and stratum deposition，the actual stratum distribution is not completely horizontal. Taking the foundation pit with inclined hard layer lying under soft soil as the research object，the influence law of slope angle hard layer and distance between slope and retaining structure on foundation pit deformation and basal heave stability are studied by establishing asymmetrical finite element model of foundation pit. The results show that：1）The slope angle and the distance between slope and retaining structure have significant influence on the deformation law and safety factor of the foundation pit. 2）The inclined hard layer causes asymmetrical distribution of soft soil on both sides of the foundation pit. The smaller the soil thickness is，the more constrained the retaining structure is. The basal heave of the pit bottom，deformation of the retaining structure and ground settlement outside the pit on the side are all smaller than that on the side with larger soil thickness.