Risk　produced　by　uncertatinty　is　an　inherent　feature　of　traffic　system,　so　by　a　survey　of　personal　socioeconomic　character,　traffic　conditions　and　psychology　expriment,　mechanism　and　characteristics　of　risk　preference　in　commuters＇　route　choice　behavior　were　studied.　Considering　the　definition　of　risk　preference　in　accordance　with　prospect　theory,　risk　aversion　and　risk　seeking　were　researched　in　gain　domain　and　loss　domain　respectively　with　linear　discriminant　analysis.　Result　shows　that　risk　preference　in　gain　domain　and　loss　domain　are　quite　different.　In　the　gain　domain　commuters　are　more　likely　to　be　risk　aversion,　which　is　related　to　the　personal　socioeconomic　characters.　©　2016,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.