Abstract: Wood-plastic composite (WPC) is a new kind of environment-friendly composite reinforced by wood fiber. In order to analyze the deformation behavior of WPC under the non-constant load and carry out effective design of long-term deformation of the structure, the creep/recovery deformation of WPC was analyzed. The superposition principle method was used to compare and analyze the overall prediction effect of the existing creep calculation model on WPC creep/recovery. The results show that none of the existing models can predict the creep recovery behavior well. The viscoelastic model based on fractional calculus was used to predict the creep/recovery behavior, and a modified fractional viscoelastic model with two-parameter method was proposed. The results show that the model can accurately reflect the static viscoelastic behavior of WPC. Based on the experimental data, the creep/recovery model parameters of different WPC materials were given.