This　paper　investigates　the　overall　fitting　accuracy　of　the　light　plane　can　be　improved　by　changing　the　relative　distance　between　camera　and　laser,　altering　the　projection　direction　of　the　light　stripe　and　increasing　the　number　of　extracted　light　stripe　in　the　multi-line　structure　light　measurement　system.　Firstly,　a　multi-line　structured　light　three-dimensional　measurement　system　platform　is　built,　and　the　existing　calibration　plate　is　modified　according　to　the　requirements　of　the　experimental　design.　Then,　laser　stripes　are　projected　onto　a　blank　area　in　the　checkerboard　to　facilitate　the　extraction　of　the　centerline　of　the　light　stripe.　Moreover,　the　three-dimensional　(3D)　point　cloud　transformed　from　centerline　of　each　stripe　is　used　to　fit　into　a　plane　by　a　random　sample　consensus　algorithm　(RANSAC).　Finally,　the　influence　of　different　experiment　methods　on　the　overall　fitting　accuracy　of　the　light　plane　is　observed.　Experiments　illustrate　that　the　proposed　experimental　methods　can　reduce　the　relative　error　of　the　overall　fitting　result　of　the　mull-line　structured　light　plane　by　more　than　two　times,　and　the　overall　calibration　accuracy　of　the　light　plane　is　improved　in　terms　of　the　error　of　angle　between　the　calibrated　light　planes.