This paper proposed a visibility constrain based automatic surface model reconstruction algorithm. This algorithm firstly introduced an automatic 3-dimensional Delaunay triangulated network modeling construction algorithm which is realized by insertion method

then constructed convex hulls enveloping all the known irregular points. On the base of initial Delaunay triangulated network

we proposed a new method of using the visibility information of feature points in images to calibrate the initial 3-dimensional model

and thus getting the actual surface model of object. The experiment results showed its reliability.