Discovery of computer networks topology is always an important basement for network management. As IPv6 becomes the official standard, topology discovery methods should be changed as well. In IPv6 network, Anonymous Routers (AR) is one problem that we must deal with. AR is one kind of router we dont know its interface information, which makes it very difficult to find out their interconnections through common ways. This paper introduces a solution to deal with it, using source-routing traceroute command and nodes degree to merge ARs or find out their relation, and finally get the topology graph.