In　order　to　the　automatic　measurement　and　reconstruction　of　the　unknown　three　dimensional　objects,　a　new　view　planning　method　based　on　the　limit　visible　region　of　the　vision　system　is　proposed　in　this　paper.　Firstly,　the　visible　and　measured　region　of　the　monocular　line-laser　vision　system　is　obtained,　and　the　limit　visible　surface　is　modeled　by　the　known　boundary　data　obtained　from　initial　view　and　is　used　to　predict　the　surface　information　of　the　unknown　object.　Then　the　visibility　criterion　of　next　viewpoint　is　determined　according　to　the　predict　curve,　and　the　position　that　could　obtain　the　maximum　visible　curve　length　in　left　or　right　planning　process　is　defined　as　the　next　best　view(NBV)　candidate　position.　The　larger　one　is　selected　as　the　final　NBV　position　by　comparing　the　visible　area　of　the　above　two　candidate　positions.　Finally,　we　have　experimentally　validated　our　research　with　some　experiments　for　reconstruction.