介绍了对地观测技术的国外发展情况，从国家安全的角度分析了对地观测技术的发展趋势；接着结合国内对地观测技术发展现状，分析了我国对地观测系统发展存在的差距，从对地观测对国家安全的重要作用出发提出了启示和建议。对地观测系统可以满足面向各种应用的对陆地、海洋、大气等各个层面的全方位、立体观测信息需求，在维护国家安全、促进经济建设和推动技术发展等诸多方面发挥着越来越重要的作用。

The foreign development of the earth observation technology is briefly introduced. The development trend of the earth observation technology is described from the angle of nation security. Besides, the shortage of the earth observation system in our country is explained on the base of the discussion on the development actuality of the earth observation technology in China. The revelation and suggestion is brought forward. The earth observation system's effect is more and more important on the economy building and technology development, which faces the different requirements on information of the land,the ocean and the atmosphere.

周志鑫（1965－），男，安徽太湖县人，博士后，北京遥感信息研究所研究发展中心研究员，主要研究方向为星载ＳＡＲ图像处理及应用技术，卫星应用技术