Through　the　analysis　of　present　research　and　application　situation　of　binocular　stereo　vision　system,　the　paper　indicates　an　opinion　that　the　structural　parameters　of　system　are　crucial　to　the　measurement　accuracy　of　system.　This　paper　focuses　on　several　parameters　to　discuss　the　effect　on　the　measurement　accuracy,　such　as　the　distance　of　baseline,　angles　between　optical　axis　and　baseline,　projection　angles　and　so　on.　According　to　measuring　principle　and　mathematical　model　of　binocular　stereo　vision　system,　through　deriving　formulas　and　drawing　curves　by　means　of　＇MATLAB＇,　the　impact　that　different　structural　parameter　has　on　measurement　accuracy　is　analyzed.　Finally,　the　correctness　of　theoretical　analysis　is　proved　by　experiment　and　the　research　result　is　summarized.　©　(2013)　Trans　Tech　Publications,　Switzerland.