Basing　on　the　relationship　between　mean　square　of　weight　acceleration　and　human　body　comfort,　a　research　on　the　correlation　between　acceleration　and　human＇s　subject　feeling　in　the　context　of　different　friction　coefficient,　roughness　and　speed　was　conducted.　First,　a　regression　analysis　basing　on　a　great　amount　of　data　from　driving　simulator　and　surveys　on　general　asphalt　pavements　was　made.　Second,　the　relationship　between　roughness,　speed　and　acceleration　under　fixed　friction　coefficient　was　figured　out.　Finally,　a　regression　function　which　reflects　the　drivers＇　riding　comfort　was　established;　meeting　the　riding　comfort　of　a　driver,　and　the　function　indicated　the　relationship　between　the　maximum　driving　speed　and　roughness　of　asphalt　pavement.