The structural form of the concrete gravity dam determines that it mainly relies on the anti-sliding force generated by its own weight to meet the stability requirements，while relying on its own weight to offset the tensile stress caused by the hydrostatic pressure to meet the strength requirements，so the numerical simulation results of the project and the application of the self-weight load during calculation.The way is directly related.This paper uses the finite element method to simulate a gravity dam project，and systematically analyzes the effects of different layered pouring conditions on the stress and displacement of the dam.The research results show that the construction process of layered pouring will greatly affect the loading path of self-weight load and the overall change trend of the structure.The finer the pouring layer，the closer the actual settlement distribution law to continuous，and the vertical deformation of the dam.It decreases with the increase of the number of layers，but the influence of the deformation amplitude decreases with the increase of the number of pouring layers；at the same time，the maximum tensile stress of the dam body increases with the increase of the number of pouring layers，and it changes almost linearly，which means that it is not considered.The simulation results of layered pouring will not truly reflect the deformation and failure of the dam.