The　traffic　signs　transfer　trip　information　to　drivers　through　vectors　like　words,　graphs　and　numbers.　Traffic　sign　with　excessive　information　often　makes　the　drivers　have　no　time　to　read　and　understand,　leading　to　risky　driving.　It　is　still　a　problem　of　how　to　clarify　the　relationship　between　traffic　sign　recognition　and　risky　driving　behavior.　This　paper　presents　a　study　that　is　reflective　of　such　an　effort.　Twenty　volunteers　participated　in　the　dynamic　visual　recognition　experiment　in　driving　simulator,　and　the　data　of　several　key　indicators　are　obtained,　including　visual　cognition　time,　vehicle　acceleration　and　the　offset　distance　from　middle　lane,　etc.　Correlations　between　each　indicator　above　are　discussed　in　terms　of　risky　driving.　Research　findings　directly　show　that　drivers＇　behavior　changes　a　lot　during　their　traffic　sign　recognition.