The　microstructure,　texture,　and　mechanical　properties　of　the　asymmetric　welded　joint　in　variable　polarity　plasma　arc　(VPPA)　welding　were　studied　and　discussed　in　this　paper.　The　asymmetric　welded　joint　was　obtained　through　horizontal　welding,　where　the　effect　of　gravity　caused　asymmetric　material　flow.　The　results　showed　that　the　grain　size　and　low　angle　grain　boundary　(LAGB)　at　both　sides　of　the　obtained　welded　joint　were　asymmetric;　the　grain　size　differed　by　a　factor　of　1.3.　The　average　grain　size　of　the　Base　Metal　(BM),　Lower-weld　zone　(WZ)　and　Upper-WZ　were　25.73　+/-　1.25,　37.87　+/-　1.89　and　49.92　+/-　2.49　mu　m,　respectively.　There　is　discrepancy　between　the　main　textures　in　both　sides　of　the　welded　joint.　However,　the　effect　of　asymmetric　metal　flow　on　the　weld　texture　was　not　significant.　The　micro-hardness　distribution　was　inhomogeneous,　the　lowest　hardness　was　observed　in　regions　with　larger　grain　sizes　and　smaller　low　angle　grain　boundary.　During　tensile　strength　tests,　the　specimens　fractured　at　the　position　with　the　lowest　hardness　although　it　has　reached　89.2%　of　the　strength　of　the　BM.　Furthermore,　the　effect　of　asymmetric　metal　flow　and　underlying　causes　of　asymmetric　weld　properties　in　VPPA　horizontal　welding　have　been　discussed　and　analyzed.