In fact, in 20 14, in order to strengthen the management of electromagnetic environment and ensure public health, China revised the Regulations on Protection of Electromagnetic Radiation (GB 8702-88) and the Hygienic Standard for Environmental Electromagnetic Waves (GB 9 175-88), and issued the Control Limits of Electromagnetic Environment (GB 8702-28). According to this standard, the power density of communication band should be less than 40 MW/cm2, while that of the United States is 600 MW/cm2, with a difference of 15 times. According to industry insiders, considering that the base station signals will overlap in level, the construction of mobile communication base stations is now one-fifth of the national standard, that is, less than 8 microwatts per square centimeter.