Today, there are different approaches to the building of the law systems in the theory of law. In the foreign science, legal scholars pay special attention to the history, drawing up one or another system and consider sidelines of science. In Russia, system of law begins from the theoretical aspects and is supported by unitized units. Despite that, system of any branch of law is very important in the process of studying law. The aim of this article is to combine Russian and foreign approaches for the creation of the modern system of international space law that will include theoretical, institutional and additional elements. The article is published in the framework of the grant of the Russian Foundation for Basic Research "BRICS and the Peaceful Uses of Outer Space" 17-03-00427. © 2020, Univelt Inc. All rights reserved.