2060-T8　Al-Li　alloy　is　a　new　aircraft　material　with　low　density,　high　specific　strength　and　well　properties　in　low　temperature　conditions.　2060-T8　Al-Li　alloy　in　2　mm　thick　is　welded　by　fiber　laser　with　5087　(Al-Mg-Zr)　filler　wire.　The　cracking　susceptibility　of　joints　obtained　under　different　welding　parameters　is　investigated.　The　microstructure　and　mechanical　properties　are　analyzed　as　well.　The　result　indicates　that,　a　higher　laser　power　or　a　larger　welding　speed　causes　the　increase　of　crack　number,　and　a　lower　wire　feeding　rate　results　in　a　higher　cracking　susceptibility.　Under　the　condition　of　3　kW　laser　power,　3　m/min　welding　speed　and　3　m/min　wire　feeding　rate,　the　weld　with　great　formation　and　few　welding　defects　are　obtained.　The　average　tensile　strength　of　joints　reaches　to　309　MPa,　and　the　tensile　fractures　occur　in　the　weld　zone.　At　the　waist　of　weld,　the　fine　equiaxed　grains　are　in　larger　quantities　and　the　columnar　crystals　are　more　refined　than　the　upside　and　downside　near　the　fusion　line,　which　resultes　from　the　mode　of　fluid　flow　in　weld　pool　and　the　thickness　of　the　boundary-layer.