Abstract: In recent years, the electromagnetic spectrum space has gradually developed into a competitive field in the game of big powers in the world, which is also one of the national strategic scarce resources. In civil electromagnetic spectrum, along with the spectrum congestion and fast growing of application services, the applications of broadband spectrum monitoring, spectrum security, big data of spectrum and intelligence have been facing great challenges. Competition games of military electromagnetic spectrum has become even more intense, and electromagnetic spectrum perception, monitoring and impact effect evaluation are facing problems such as limited sensing approaches and insufficient capabilities in spectrum management, control and collaborative applications. Firstly, the recent status, challenges, and development trends in abroad of typical electromagnetic spectrum space applications are reviewed. Then, the domestic studies on overall design, planning management, typical engineering practices and key techniques for electromagnetic spectrum applications are analyzed. Finally, some development suggestions on domestic electromagnetic spectrum space applications are summarized and presented.