The　metal　plate　drawing　is　a　complex　process　of　plastic　deformation.　It　is　applied　to　manufacturing　product　of　all　kinds　of　large-scale　auto　overlay　parts　and　other　parts.　The　working　principle　and　test　method　of　the　metal　strip　bend　tensile　tester　are　detailed:　this　tester　can　simulate　the　friction　field　change　rule　of　the　cavity　die　round　angle　band;　measure　the　change　rule　of　friction　factor　by　selecting　different　die　surface　roughness,　alter　the　tensile　force　and　deformation　velocity　of　strip　and　the　mean　surface　pressure　of　forming　roll.　The　effect　of　die　surface　roughness　and　other　factors　on　the　friction　character　of　the　stretched　plate　with　this　tester　is　studied.　It　is　indicated　that　reducing　die　surface　roughness　properly　is　in　favour　of　developing　boundary　lubrication,　and　reduces　the　generation　and　effect　of　the　friction　heat.　The　friction,　wear　and　lubrication　in　drawing　process　are　organically　combined　by　this　research　technique.　It　provides　the　theoretical　basis　for　optimizing　friction　conditions　of　machining　drawn　component.