In　the　recent　years,　in　china,　speeding　is　one　of　the　most　serious　road　traffic　violations　and　is　one　of　the　main　reasons　that　cause　road　traffic　accidents.　In　2007,　the　road　traffic　accident　fatalities　caused　by　speeding　account　for　14.06%　of　the　total,　ahead　of　the　main　reasons　for　the　accident,　so　the　treatment　of　speeding　is　the　main　task　of　the　traffic　control　department.　This　article,　from　the　point　of　view　of　expected　speed　of　driver,　studies　the　mechanism　of　its　formation,　and　establishes　the　relationship　model　between　speeding　rate　and　traffic　volume　through　the　measured　data　in　the　field.　The　model　can　help　traffic　control　department　to　identify　road　sections　and　time　sections　in　which　speeding　happens　very　often.　That　will　allow　police　to　focus　on　control　and　improve　law　enforcement　efficiency　and　reduce　the　cost　of　law　enforcement.　©　2009　ASCE.