The　hydrophilic　surfaces　of　PA2200　three-dimensional　(3D)　printing　parts　arc　prepared　quickly　through　218　nm　KrF　excimer　laser　irradiation,　whose　contact　angles　decrease　from　121　degrees　to　70　degrees　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　arc　analyzed.　The　Cassie-Baxter　model　is　also　studied.　The　experimental　results　show　that　KrF　excimer　laser　irradiation　can　not　only　make　PA2200　311)　printing　part　surfaces　smooth,　but　also　simultaneously　generate　C　=　O　double　hydrophilic　groups,　and　thus　the　surface　wettability　of　PA2200　311)　printing　parts　arc　improved　and　controlled.