地面互联网技术的快速发展以及航天任务的复杂性不断提高，产生了将互联网扩展到空间、建立天地一体化航天互联网的强烈需求，并提供了实现的技术可能性。探讨了我国航天任务中存在的不同卫星天地协议不统一、航天任务数据不能共享、资源综合利用率低等问题，分析了对未来任务的需求，阐述了建设我国天地一体化航天互联网的重要意义；介绍了国外航天互联网发展状况；提出了我国天地一体化航天互联网的总体目标、组成、网络体系结构及网络协议的初步构想；分析了需要突破的关键技术；最后提出了发展步骤建议。

The rapid development of terrestrial network technologies and the increasing complexity of space missions have generated a strong demand to extend the internet to space and to establish an integrated space-ground network system, and technologies today have already provided feasibility for doing so. The current situation in China is that space-ground protocols are not unified for different spacecraft in spaceflight missions. Space mission data can not be shared and the integrated data utilization ratio is still low. This paper analyzes the demand of future space missions and demonstrates the significance for China to develop its integrated space-ground network system. Status quo of space-based network system abroad is introduced. A concept on the overall objective, composition, network system architecture, and network protocols is proposed. Some key technologies are analyzed. Finally, suggestions are given regarding the steps of development.