Methodology　of　automatic　generation　of　test　cases　based　on　Model　Driven　Architecture　is　proposed,　and　its　design　and　implementation　have　be　done.　The　process　of　generating　test　cases　is　that　a　platform-independent　model　is　converted　into　a　platform-independent　test　model　through　level　conversion,　and　the　platform-independent　test　model　is　converted　into　the　corresponding　test　cases　through　vertical　conversion.　The　basic　structures　of　the　system　model　and　the　test　model　are　designed　using　Web-application　system　for　the　study.　The　conversion　rules　from　the　system　model　to　the　test　model　are　designed　using　the　model　to　model　conversion　method.　The　conversion　rules　from　the　test　model　to　the　test　cases　are　designed　using　the　model　to　code　conversion　method.　Ultimately,　the　relevant　test　cases　are　generated.　©　2010　IEEE.