5A90　aluminum-lithium　(Al-Li)　alloy　thin　sheets,　machined　with　a　square　butt　weld　preparation,　were　welded　by　Nd:YAG　laser.　Microstructure　and　texture　characterization　in　the　laser　welds　were　studied　by　means　of　optical　microscope　(OM),　scanning　electron　microscope　(SEM)　coupled　with　energy　dispersive　X-ray　spectroscopy　(EDS),　electron　back　scattered　diffraction　(EBSD),　and　compared　with　the　unaffected　base　metal.　The　results　show　that　the　weld　metal　(WM)　microstructure　is　displayed　significant　changes　in　solidification　structure,　and　microtexture.　The　predominantly　fine　equiaxed　dendritic　microstructure　in　the　WM　zone　is　observed　and　rationalized　on　the　basis　of　solidification　mechanism　and　heterogeneous　nucleation　mechanism.　The　pole　figures　of　5A90　Al-Li　sample　exhibit　a　typical　cold　rolling　textures　structure　of　FCC　metals,　while　the　laser　welds　in　5A90　Al-Li　alloys　are　shown　to　exhibit　a　randomly　textured　microstructure.