Short-time　withstanding　current　is　a　key　parameter　of　air　circuit　breakers.　Due　to　the　structure　of　multiple　parallel　contacts,　the　outer　movable　conductors　tilt　and　slide　seriously　when　withstanding　the　large　short-circuit　current.　This　paper　is　aimed　to　investigate　the　contact　behavior　of　the　tilted　contact.　A　new　designed　experimental　setup　to　measure　the　minimum　repulsion　current　and　the　contact　resistance　of　the　tilted　contact　is　developed.　Contact　force　and　tilt　angle　can　also　be　measured　and　adjusted.　Based　on　the　measured　results　and　the　impression　marks　of　the　tilted　contact,　it　is　concluded　that　the　repulsion　force　and　the　contact　resistance　are　increased　seriously　when　the　contact　is　tilted.　During　the　contact　tilting　process,　the　contact　type　is　changed　from　the　line　contact　to　the　point　contact　and　the　contact　center　is　offset　to　the　edge　of　the　movable　contact.　In　addition,　with　the　help　of　contact　bridge　model,　it　is　also　found　that　the　contact　type　transition　plays　a　dominant　role　on　the　increase　of　the　repulsion　force　and　contact　resistance.