37　kinds　of　graphs　wereselected　onthetheory　of　integrating　design　and　practical　application.　The　graphs　were　divided　into　elementary　type,　special　type　and　extended　type.　The　method　included　using　subjective　questionnaire　and　static　experimental,　recording　the　visual　cognition　time　of　different　graphs　and　combining　with　the　method　of　one-way　ANOVA.　The　result　indicates　that　the　visual　cognition　time　of　the　37　graphics　presents　substantial　difference.　From　the　classification　point　of　view,　graphs　of　special　type　and　extended　type　indicating　complex　interchange　are　more　difficult　to　visual　cognition　than　those　of　elementary　type　indicating　standard　single　interchange.　The　visual　cognition　time　is　1.18times.　In　diagrams　of　elementary　type,　the　diagrams　for　loop　ramps　are　more　difficult　to　visual　cognition　than　those　for　directional　ramps　and　semi-directional　ramps.　The　visual　cognition　time　is　1.31times.　The　form　of　arranging　the　exit　of　right-turn　ramp　ahead　of　the　exit　of　left-turn　ramp　is　more　conformity　to　the　thinking　habit　of　drivers　and　the　visual　cognition　time　is　shorter.　©　2016,　Editorial　Department　of　Transaction　of　Beijing　Institute　of　Technology.　All　right　reserved.