Tunnel　monitoring　and　measurement　is　a　very　important　part　of　the　tunnel　construction　safety　andit　is　one　of　the　important　contents　of　tunnels　on　Railway　Passenger　Dedicated　Line＇s　segment　acceptance,　Its　purpose　is　through　the　tunnel　clearance　convergence　and　settlement　observation,to　analysis　data,　optimize　tunnel　construction　and　design,　and　determine　a　reasonable　safety　step　and　support　time,　protect　tunnel　construction　and　operational　safety,　Although　the　domestic　and　foreign　on　tunnel　monitoring　measurement　work　are　very　seriously,　but　at　present　the　requirements　of　monitoring　level　and　information　construction　are　far　away.　This　article　based　on　3D　laser　scanning　technology,　proposed　tunnel　3D　laser　scanning　measurement　and　data　visualization　technology,　through　the　engineering　application　and　practice,　the　results　show　that　the　technique　can　be　real-time,　accurate　and　comprehensive　to　get　the　deformation　data　of　tunnel　space,and　can　analysis　and　counter-analysis　the　deformation　of　tunnel　construction,　it　has　greatapplication　value　of　engineering　for　early　warning　forecast　the　risk　and　guidingtunnel　construction.