The　objective　of　this　study　is　to　find　factors　influencing　the　injury　severity　of　vehicle　at-fault　accidents　in　Shenyang　(China),　and　discuss　the　commonalities　and　differences　between　passenger　and　freight　vehicle　accidents.　We　analyzed　1647　traffic　accidents　from　2015　to　2017,　in　which　motor　vehicles　were　fully　or　mainly　responsible,　including　1164　traffic　accidents　caused　by　passenger　vehicles　and　483　traffic　accidents　caused　by　freight　vehicles.　Twenty　influencing　factors　from　the　aspects　of　accident,　driver,　time,　space　and　environmental　attributes　are　analyzed　to　find　their　statistical　connection　with　injury　severity　using　the　binary　logistic　regression　model.　For　passenger　vehicles,　five　influencing　factors　(side　collision;　illegal　act　while　driving;　hit-and-run;　season　and　administrative　division),　showed　statistically　significant　correlations　with　the　injury　severity.　For　freight　vehicles,　three　influencing　factors　(illegal　act　while　driving;　season　and　administrative　division),　showed　statistically　significant　correlations　with　the　injury　severity.　Illegal　act　while　driving　is　the　only　common　influencing　factor　for　the　injury　severity　of　both　passenger　and　freight　vehicle　accidents.　Side　collision　and　hit-and-run　are　significant　influencing　factors　for　the　injury　severity　of　passenger　vehicle　accidents,　but　not　for　freight　vehicle　accidents.　Season　and　administrative　division　present　different　results　on　influencing　passenger　and　freight　vehicle　accidents.　Based　on　these　results,　measures　including　driver　education　and　road　infrastructure　improvement　could　be　implemented　to　reduce　the　injury　severity　of　accidents　in　passenger　and　freight　vehicles.