In order to quantitatively analyze the influence of the zoning and mechanical property differences of rockfill on the deformation of concrete-faced rockfill dams (CFRDs), the nonlinear finite element method is used to calculate the deformation of a typical CFRD with a height of 200 m during the completion, impoundment and deformation stability period, with an emphasis on the analysis of the influence of five different primary and secondary rockfill zoning schemes and four different rockfill modulus ratios on the dam deformation. Through the comparative analysis of deformation and extreme value distribution law, it can be concluded that the boundary between different primary and secondary rockfill zones has little influence on the distribution of dam deformation, and the maximum dam settlements changes do not exceed 10%. The rheology of dam body accounts for not more than 0.14% of the dam height during the impoundment period. When the modulus of secondary rockfill is reduced, the rheological effect of the dam gradually increases.