The　magnetic　pulse　welding　(MPW)　were　carried　out　with　the　1060　Aluminum　tube　and　AZ31　Magnesium　alloy　bar　with　different　surface　conditions.　Quantitative　analysis　of　the　interface　morphology　of　the　obtained　Al-Mg　MPW　joints　was　conducted.　The　heat　production　mechanism　during　MPW　process　was　studied.　The　results　show　the　MPW　joints　interface　exhibits　wave　morphology　which　is　the　typical　character　of　high　velocity　impact　welding.　The　pocket　type　melting　phase　is　distinguished　at　the　joint　interface　by　Mg　bar　with　the　smooth　surface.　However,　the　continuous　melting　layer　is　found　at　the　joint　interface　by　Mg　bar　with　the　rough　surface.　The　bumps　on　the　rough　surface　can　catch　more　impacting　jet,　and　disturb　the　transportation　of　the　surface　wave,　which　also　block　the　heat　lost　process.　So　the　interface　temperature　rises　and　the　melting　layer　forms.