Abstract: With the increasingly severe environment confronted by radar, RF stealth has become an important technical means to improve radar anti-reconnaissance capability and survivability. Based on the analysis of the development status of radar and its countermeasure technology, this paper expounds the importance and necessity of RF stealth technology in radar system. By studying the principle of low intercept probability, the research direction and method of controlling RF radiation in multi-dimensional space, including the time, frequency, space and energy domain, and integrating with the battlefield environment are proposed, which provide references for the development of radar equipment with stealth performance and relevant technical research.