Abstract: How to construct next generation high availability network with integrated services is one of the research directions of today’s network field. In this paper a high availability network based on reliable network topology and the macroscopic definition on network availability are studied. Also discussed and analyzed are seven key issues impacting the construction of high availability network which include the design of network architecture, service management, resource management, network security, open application, network management and indexes evaluation. It is indicated that design of the architecture of high availability network should be considered syntheticatlly. The principle of demand requirement and services focused is put forward. Finally, HaGrid’s idea is introduced.