Brillouin　light　scattering　technique　can　be　successfully　used　to　determine　the　whole　set　of　elastic　and　piezoelectric　constants　of　a　ZnO　single　crystal　irradiated　by　different　laser　energy　densities,　into　a　micron　range　(radiation　layer　thickness)　It　is　found　that　the　scattering　intensity,　the　linewidth　and　the　Brillouin　scattering　shift　of　acoustic　phonons　are　all　strongly　dependent　on　laser　energy　density　Based　on　the　sound　propagation　equations　and　these　results,　the　directional　dependences　of　the　compressional　and　shear　moduli　of　the　irradiated　ZnO　sample　in　the　(001)　plane　are　investigated　It　is　found　that　under　an　appropriate　laser　condition,　248　nm　KrF　excimer　laser　irradiation　can　significantly　Improve　the　surface　quality　and　increase　the　elastic　properties　of　ZnO　single　crystal　This　procedure　has　potential　applications　in　the　fabrication　of　ZnO-based　surface　acoustic　wave　and　optic　electronic　devices