A distributed RTI cannot be well adapted to large-scale simulations in a wide area network, especially on maintaining the consistency of the whole federation state. However a hierarchical RTI (runtime infrastructure) is very useful to reduce the computational cost of the large-scale simulations. This paper explains why the hierarchical simulation runtime infrastructure StarLink can be applied to the wide area network, and discusses three implementation techniques of StarLink, including CORBA based networking technique, multiple-threaded data transferring technique and XML based data exchanging technique. In addition, test methods for StarLink are discussed, and a new idea is put forward to test RTI’s interface services using a common framework test program. StarLink can effectively provide a powerful technology support for the large-scale simulations.