The　light　guide　plate　(LGP)　as　the　backlight　of　the　liquid　crystal　display　(LCD),　has　been　applied　widely.　The　manufacturing　principle　arranging　the　reflection　point　on　the　surface　of　the　the　LGP　material.　Currently　LGP　for　lighting　is　manufactured　by　screen　printing　and　laser　engraving.　Laser　engraving　is　more　personalized,　flexible　and　green,　but　the　traditional　laser　engraving　way,　whose　efficiency　is　too　low,　is　lack　of　processing　optimization.　A　methodology　of　laser　dots　marking　that　based　on　dynamic　focus　galvanometer　system　is　proposed.　The　corresponding　process　optimization　method　is　developed.　It　improves　the　effectiveness　and　efficiency　of　processing　significantly.