The　hydrophilic　surfaces　of　PA2200　three-dimensional　(3D)　printing　parts　are　prepared　quickly　through　248　nm　KrF　excimer　laser　irradiation,　whose　contact　angles　decrease　from　121°　to　70°　and　phase　structures　do　not　change　after　irradiation.　With　the　calibration　tools　of　X-ray　diffractometer,　Raman　spectroscopy,　scanning　electron　microscope,　X-ray　photoelectron　spectroscopy　and　so　on,　the　surface　morphologies　and　microstructures　of　printing　parts,　number　and　types　of　polar　functional　groups　are　analyzed.　The　Cassie-Baxter　model　is　also　studied.　The　experimental　results　show　that　KrF　excimer　laser　irradiation　can　not　only　make　PA2200　3D　printing　part　surfaces　smooth,　but　also　simultaneously　generate　C=O　double　hydrophilic　groups,　and　thus　the　surface　wettability　of　PA2200　3D　printing　parts　are　improved　and　controlled.　©　2018,　Chinese　Lasers　Press.　All　right　reserved.