Traffic　safety　is　a　difficult　problem　around　the　world.　It　is　desirable　to　analyze　the　crash　distribution　rules　to　reduce　traffic　crashes.　However,　extensive　research　is　needed　to　support　policy-makers　and　road　safety　engineers　to　make　scientific　decisions　and　to　take　effective　measures　in　China.　The　objective　of　the　paper　is　to　reveal　the　distribution　rules　of　crashes　in　China.　Using　statistics　data,　this　paper　discusses　crash　frequency　and　severity　distributions　by　various　factors,　including　temporal　dimension,　road　factors　(such　as　road　classes　or　functions,　geometric　alignment,　etc.),　vehicles　factors,　and　drivers＇　factors　in　details.　The　distributions　of　crash　type　and　crash　causes　are　also　examined　in　the　paper.　A　series　of　useful　and　interesting　conclusions　are　available　for　domestic　and　overseas　traffic　policy-makers　and　road　safety　engineers.　©　2009　ASCE.