In terms of the verification to the fatigue of asphalt pavements by using the method of the RDO Asphalt 09, a lot of experiences could be gained. These experiences were used to advance the technical regulations. On the other side the valuation of the deformation behavior of asphalt pavements is currently based on the assessment of the rutting on the basis of deviatoric equivalent stresses. With this procedure only comparative assessments of different designs and materials can be made. So the plastic deformation properties of the materials are not considered. Furthermore, no information of the temporal plastic deformation behavior of the construction, as well as the depth of the ruts at a specific time of usage can be made. In recent years there have been made some improvements to the method of the prediction of rutting. Now all load conditions were used, which are taken into account in the dimensioning process. For the different stress conditions triaxial or uniaxial cyclic compression tests on slim specimens were made to determine material-dependent impulse creep curves and then they were described based on a model. In this paper, the statistical material model of the deformation behavior and the improvements regarding the procedure of the prediction of rutting are explained and results of calculations are presented.