Type　2524　aluminum　alloy　is　an　Al-Cu-Mg　alloy　with　high　damage　tolerance　for　aerospace　applications.　High　power　fiber　laser　welding　of　1.6　mm　thick　2524　aluminum　alloy　sheets　was　conducted　with　5087　aluminum　alloy　filler　wire.　The　effects　of　laser　power,　welding　speed　and　wire　feeding　speed　on　the　weld　appearance,　solidification　cracking　susceptibility　and　microstructure　were　investigated.　The　microhardness　and　mechanical　properties　of　the　crack-free　joints　were　tested.　The　results　indicate　that　welding　with　5087　aluminum　alloy　filler　wire　could　shorten　the　columnar　dendritic　grains,　refine　the　equiaxed　dendritic　grains,　increase　the　quantity　of　grain　boundary　and　reduce　the　hot　cracking　susceptibility.　A　defect-free　joint　with　good　surface　appearance　was　obtained　with　optimized　welding　parameters:　2.5　kW　laser　power,　2　m/min　welding　speed　and　2　m/min　wire　feeding　speed.　The　tensile　strength　of　the　joints　was　313-324　MPa,　and　ductile　fracture　with　plenty　of　dimples　occurred　around　the　weld　fusion　line.