Abstract: According to a section of the old cement concrete pavement project in National Road 206 route,this paper investigates,analyzes,and examines the operational conditions of this old pavement,and presents the effective additional spreading course structure on the old cement pavement,and design measures of the pavement drainage system and pavement structure drainage system through the comparison and choice of the project construction program,which have instructive meaning for the structure design of the additional spreading course of the aged cement concrete pavement