It　is　very　important　to　study　driver　behavior　to　ensure　traffic　safety.　Electrocardiograph,　Freecod　data　collecting　system　and　dynamics　GPS　are　utilized　to　study　the　eight　drivers＇　behavior　under　emergency　in　the　Transportation　Communication　Trial　Field.　Firstly,　driving　pones　factor　was　given.　Secondly,　driving　time,　personality,　driving　experience　and　age　were　quantified,　finally　the　improved　mixing　effects　model　between　maximum　steering　velocity　and　heart　rate　change　rate　were　established　and　the　model　was　testified.　The　results　show　that　the　model　is　valid.