A　dynamic　visual　cognition　experiment　was　carried　out　in　driving　simulation　barn　with　eye　tracker　system　to　get　drivers＇　eye　movement　parameters　when　they　were　reading　traffic　signs　with　various　information　quantities　in　different　speeds.　The　eye　movement　parameters　include　fixation　number　and　duration.　Driver＇s　visual　area　was　divided　into　three　areas　using　dynamic　cluster　method.　Further　analysis　was　conducted　on　the　eye　movement　parameters　of　the　three　areas.　Findings　were　discussed　in　this　paper:　the　fixation　distribution　has　a　high　correlation　with　driving　speed　and　information　quantity.　As　the　driving　speed　and　information　quantity　increased,　the　fixation　number　and　duration　in　traffic　sign　area　have　an　increasing　trend　and　drivers　have　less　visual　cognition　to　front　lane.　When　the　guide　signs　have　more　than　five　amount　of　information,　drivers＇　fixation　number　and　duration　have　an　abrupt　change　and　the　effectiveness　of　visual　cognition　decreased　significantly.　It　is　recommended　that　the　highway　traffic　guide　sign　information　volume　should　not　exceed　5.　Under　the　same　condition,　the　driver　needs　more　fixation　when　recognizing　non-guide　signs　and　the　visual　cognition　process　is　more　complicated.　©　2011　China　Association　for　Science　and　Technology.