Driver　behavior　is　a　crucial　point　in　highway　safety,　and　of　particular　importance　in　traffic　behavior　studies.　An　approach　to　detect　driver　motions　that　directly　contribute　to　vehicle　maneuver　is　proposed.　Motion　capture　is　the　process　of　recording　and　tracking　driver＇s　body　movements.　Firstly,　driver　motion　capture　technique　is　used　to　obtain　the　position　information　of　some　key　joints　of　driver＇s　body　in　3D　space　and　the　driver　motion　database　is　then　established.　Secondly,　driver　behavior　is　analyzed　based　on　the　motion　data　collected.　Thirdly,　characteristics　of　driver　motions　are　combined　with　the　database　to　recognize　driver　motions　and　calibrate　motion　parameters,　including　motion　speed,　movement　intensity　etc.,　which　can　offer　a　better　understanding　of　driver　behavior.　The　procedures　of　capturing,　modeling,　analyzing,　and　recognizing　driver　motions　in　real　driving　environment　provide　an　effective　method　for　the　research　on　complex　driver　behavior,　and　the　method　of　charactering　driver　behavior　using　motion　capture　will　make　substantial　contribution　in　further　research　on　driver　behavior.