On basis of the Burgers model,a new model consisting of modified dashpot and Van Der Poel model was derived from rheological and viscoelastic theory.Subsequently,triaxial repeated load permanent deformation tests of AC16 asphalt mixtures were conducted to validate this new de-veloped model.Parameters of new developed model were obtained by a nonlinear regression analysis of test data,and then permanent strains and flow number of each mixture were calculated.The ex-perimental results prove that the new developed model can well describe three phases permanent de-formation of asphalt mixture under repeated load and it can be used for pavement mechanical analysis and rutting prediction.