The　motion　process　of　permanent　magnetic　mechanism　and　dynamic　characteristics　of　the　contact　arc　are　the　major　factors　that　determine　the　performance　of　the　magnetic　latching　relay.　However,　due　to　its　small　and　compactness,　the　motion　characteristic　of　the　mechanism　and　the　dynamic　process　of　electric　arc　are　difficult　to　measure　accurately.　In　view　of　the　advantages　on　image　acquisition　of　the　high-speed　camera,　the　test　device　based　on　high-speed　camera　system　for　relay＇s　dynamic　characteristics　test　is　designed　in　this　paper.　The　non-contact　testing　and　image　processing　of　the　dynamic　characteristic　of　mechanism　and　contact　arc　are　accomplished.　On　the　basis　of　the　test,　the　dynamic　characteristics　of　armature,　contact　and　the　arc　characteristic　are　analyzed.　Meanwhile,　the　time　parameters　of　dynamic　process　are　measured　by　digital　storage　oscilloscope　to　validate　the　data　testing　by　high-speed　camera　system.