The　article　analyses　the　human　factors　of　traffic　accidents　in　traffic　accidents　by　expounding　the　interactions　of　people,　vehicle,　road,　environment.　A　critical　cause　-　human　factors　is　brought　up　by　constructing　and　analyzing　the　catastrophe　model　of　leading　to　the　accidents.　The　author　divides　human　factors　into　subject　human　factors　and　object　human　factors,　and　then　some　influences　are　discussed.　At　last　some　measures　are　given　to　prevent　human　errors　and　ensure　traffic　safety.