Optical　fiber　laser　and　its　application　research　become　one　of　focuses　in　recent　years,　for　its　specific　high　beam　quality　characteristics.　The　current　microlens　processing　methods　involve　in　many　steps,　long　processing　period.　This　paper　reported　a　new　fabrication　method　of　refractive　microlens　with　fiber　laser.　The　mechanism　of　obtained　spherical　surface　on　PMMA　material　was　based　on　the　laser-induced　local　thermal　plastics　deformation.　The　experiment　setup　was　constructed,　involving　a　fiber　laser,　a　focus　lens,　a　work　piece　bearing　stage,　a　viewing　microscope.　We　directly　made　the　fiber　laser　irradiating　on　the　transparent　polymer　plate,　while　controlling　the　defocused　distance,　laser　power,　and　exposing　time,　and　succeeded　in　producing　microlens　with　diameter　and　surface　curvature　size　from　several　hundred　micrometers　to　millimeters.　We　performed　the　orthogonal　design　test　and　made　its　data　analysis.　By　doping　with　the　experimental　data,　the　main　influential　factors　of　obtained　refractive　microlens　were　match　up　with　curve　fitting.　The　research　results　show　that　the　fiber　laser　output　power　has　the　extinct　effect　on　the　produced　microlens　parameters,　whereas　the　irradiating　time　has　subordinate　affection　and　the　defocused　distance　has　scarcely　any.　The　relationship　formulae　between　the　optical　fiber　laser　processing　parameters　and　lens　parameters　were　acquired.