In　this　paper　we　derive　some　new　equations　and　we　call　them　MHD-Leray-alpha　equations　which　are　similar　to　the　MHD　equations.　We　put　forward　the　concept　of　weak　and　strong　solutions　for　the　new　equations.　Whether　the　3-dimensional　MHD　equations　have　a　unique　weak　solution　is　unknown,　however,　there　is　a　unique　weak　solution　for　the　3-dimensional　MHD-Leray-alpha　equations.　The　global　existence　of　strong　solution　and　the　Gevrey　class　regularity　for　the　new　equations　are　also　obtained.　Furthermore,　we　prove　that　the　solutions　of　the　MHD-Leray-alpha　equations　converge　to　the　solution　of　the　MHD　equations　in　the　weak　sense　as　the　parameter　epsilon　in　the　new　equations　converges　to　zero.　(c)　2006　Elsevier　Inc.　All　rights　reserved.