Abstract: The complex electromagnetic environment, under which a type of VHF radio is used in the normal frequency hopping network model is analyzed. Based on the spectrum occupancy, time occupancy, spatial coverage of the electronic equipment, which result in the threat, target and background electromagnetic environments, the quantitative classification standard of the complex electromagnetic environment is proposed. The simple, mild, moderate and severe complex electromagnetic environments are constructed for the VHF radios by using the real radios and simulation technology. The adaptability of the VHF radios is evaluated against different level of the complex electromagnetic environment. The results provide a useful reference for the adaptability test theory study of our electronic equipment to the complex electromagnetic environment in the future.