Through　the　analysis　of　generation　and　distribution　of　the　maximal　shearing　strength　in　the　bituminous　pavement,　it　is　discovered　that　the　vertical　load　may　make　shear　strength　increase　when　the　relative　stiffness　is　bigger　and　the　thickness　is　thinner　at　the　crossing　of　city　roads,　especially　of　high　velocity　and　over　loading.　Exorbitant　centralization　of　the　shear　strength　leads　to　cut　demolishing.　In　order　to　overcome　and　reduce　asphalt　pavement　rut,　we　should　consider　the　design　of　the　material　and　the　structure.　This　article　brought　forward　the　control　parameter　of　the　level　load　in　structure　design　besides　design　deflection.