For the problem of how to link a set of segments to a simple polygon with the shortest whole length,a sufficient condition that a given set of segments can be joined into a simple polygon is given. It is proved that the nearest point or second nearest point of the end point can be obtained in Delaunay triangulation for the end points of a set of segments S. Based on this result,the method of joining a segment into a polygon is given for getting the polygon with the shortest length. Then,a new algorithm for ...