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The rapid development of space technology and space applications space network proposed the urgent needs of the global expansion of the Internet services, and extending to the outer space of the Earth is the inevitable trend of development of network technology. Internet services to expand extends to the space key technology research, has become a hot research field in recent years related. Has distinctive characteristics different from the terrestrial space environment, space spacecraft node high-speed movement, changing the network topology, the information transmission delay, error rate, and frequent communication link disconnected, has brought new challenges to the network construction and demand, to this end, we must study established a full line of actual space development, network protocol system to adapt to the requirements of the new future trends, and provide strong technical support for the construction of China's space network. Firstly overview of the development of the space network and volume extended network characteristics and key technologies, summed up the special requirements of the space environment characteristics of the formation of networks, Yung extended network technology application in this condition have good natural attributes, The feasibility of the capacity extension of the network technology used in the space environment. On this basis, a space-oriented environment Yung extended network routing algorithm - \Increase the number of copies required to forward packets through the network to deal with the failure of the network may experience a variety of reasons, enhanced routing algorithm robustness; while taking advantage of the space environment changes in the network topology, node trajectory strictly predictable regularity information, calculate the optimal path routing forwarding packets to achieve fast forwarding of the message; Finally, by flooding the network. \buffer management strategy, the congestion occurs selectively dropping packets, and enhance the ability to forward the packet routing algorithm in the network congestion. Papers using the ONE simulator the simulation scene by transforming bandwidth, buffering, packet size, simulation time, packet TTL value parameters, the performance of the algorithm was validated. And under the same conditions, with three kinds of typical network capacity extension algorithm Epidemic, Spray and Wait, PRoPHET a comparative analysis. Experimental results show that: in packet delivery ratio, our algorithm than Spray and Wait, 10% -30%, than Epidemic and PRoPHET, 30% -50%; network average delay of 10% lower than the the Spray andWait algorithm than the overhead required to send packets, just 10% of of Epidemic and PRoPHET algorithm even 1%. Finally, we summarize outlook in this article, pointed out the lack of current research and recommendations for follow-up studies.
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