To meet the requirements of accurate and convenient 3D measurement for some large parts,a new industrial optical measuring method was put forward, which was based on digital close-range industrial photogrammetry and 3D optical points dense cloud measurement.Based on photogrammetry theory , digital close-range industrial photogrammetry software named by XJTUDP software had been exploitured,it mought calculate un-coded points and coded-points fixed on the surface of large parts,it took a solid basement for the fusion of much pieces point cloud. On the basis of computer two-eye vision technology and heterodyne multiple frequency technology, 3D dense point cloud optical measurement software named by XJTUOM software had been developed,3D data of the object surface mought be acquired precisely by means of this way, According to the whole marked points come from XJTUDP,every pieces of point cloud mought be assembled automatically. Experimental studies show that the developed system possesses good accuracy,it can identify the fine structure on a large part,it is also portable and convenient for field measurement.
