In recent years, the research and development of environmental action monitoring at home and abroad are in full swing. RF sensing has achieved a series of breakthrough research results based on its advantages in the application of behavioral identification, positioning and target monitoring. This paper first introduces the application scenarios of RF-awared environment monitoring and compares them with traditional environmental monitoring technologies. Then it analyzes the basic principles of RF sensing technology and the applications of signal acquisition method, feature extraction method, fingerprint database establishment method and machine recognition method in behavior recognition, positioning and target monitoring. Finally, the limitations of the current research and the future development directions are pointed out.