A LTP system for measuring 3-dimentional shape is provided to scan a whole surface of objects without a roundtrip of a transport unit at a time. A LTP(Long Trace Profiler) system for measuring 3-dimentional shape comprises a secondary axis scanner unit(130) changing a route of the laser beam to be parallel; a transport unit(160) moving to a first axis on a plane of measurement of objects(170); the laser beam outputted from the secondary axis scanner unit; a beam path controlling unit(120,150) controlling the route of the laser beam reflected from the objects; and a shape operation unit(190) computing the shape of objects surface by computing an angle of the location where the laser beam is irradiated.
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