Two　types　of　material,　including　5A06　aluminum　alloy　with　1.2mm　thickness　and　5A90　aluminum-lithium　alloy　with　3mm　thickness,　were　joined　by　laser　welding　with　ER5356　filler　wire.　The　effects　of　welding　parameters　(the　distance　between　the　laser　and　the　filler　wire,　weld　feed　speed,　laser　power　and　welding　speed)　on　welding　appearance　were　researched.　The　results　show　that　the　good　welding　appearance　can　be　obtained　when　the　distance　between　the　laser　and　the　filler　wire　is　controlled　within　a　range,　and　the　range　is　affected　obviously　by　the　welding　speed.　Meanwhile,　the　higher　wire　feed　speed　and　greater　wire　feed　speed　range　tend　to　appear　when　the　thinner　aluminum　alloy　sheet　is　welded.　The　effect　of　welding　speed　on　welding　appearance　is　larger　than　that　of　laser　power.　As　the　welding　speed　increases,　the　laser　power　increases　in　order　to　realize　the　two　welding　parameters　match　each　other.　Besides,　during　laser　welding　with　filler　wire　on　the　condition　of　good　welding　appearance　and　complete-penetration,　the　welding　input　should　be　kept　as　lower　as　possible.