Aluminum-lithium　alloy　is　considered　to　be　one　of　the　promising　light-weight　materials　for　aerospace　applications.　In　the　experiment,　T-joint　of　2060-T8/2099-T83　aluminum-lithium　alloy　with　thickness　of　2　mm　is　welded　by　using　two　high　brightness　solid　state　lasers　from　the　two　sides　of　the　stringer　aimed　to　integral　aircraft　fuselage　panels.　The　weld　porosity,　cracking　and　joint　mechanical　properties　are　investigated.　The　results　show　that　macro　hydrogen　pores　can　be　avoided　only　when　the　surface　layers　are　removed　at　least　0.15　mm　thick,　while　the　hot　cracking　can　be　completely　eliminated　with　filler　wire　of　AlSi12　and　an　appropriate　bevel　design.　The　hoop　tensile　strength　of　laser-welded　T-joints　is　among　385-415　MPa,　82.5%　of　that　of　the　2060-T8　skin　sheet.　The　bond　is　the　weakest　region　of　the　joint.