In　this　paper,　we　investigate　the　laser　irradiation　of　ZnO　single　crystals　and　its　influence　on　photoluminescence.　Our　study　shows　that　the　photoluminescence　of　ZnO　single　crystals　strongly　depends　on　surface　morphologies.　The　ultraviolet　emissions　of　laser　treated-ZnO　under　200　mJ/cm(2)　become　stronger,　whereas　for　those　deteriorated　by　irradiation　above　200　mJ/cm(2),　the　green　emissions　centred　at　2.53　eV　are　significantly　enhanced　with　a　red-shift　to　2.19　eV,　probably　due　to　the　changes　in　the　charge　states　of　the　defects.　Enhanced　yellow-green　emissions　are　well　resolved　into　four　peaks　at　around　1.98,　2.19,　2.36,　and　2.53　eV　due　to　a　shallow　irradiation　depth.　Possible　origins　are　proposed　and　discussed.