In the past, microwave radiation is generally considered 'good' (hy photon energy of about 10 exponent -6 -10 exponent -4 eV). However, in recent years many studies have shown vivo extremely sensitive to microwave and it may cause danger to human health, especially the central nervous system. Survey results of microwave radiation exposure early in 120 different locations in the Hanoi area (the area near the BTS) and about 38 handy of different mobile phone (during the call or hear) the results: the rate of radiation exposure unstable (from 0.0049 - 0.0089mW/cm2), although the capacity is smaller than a critical threshold of the WHO (1mW/cm2) and recommended ICNRP (for a 10MHz HF radiation to 10GHz: SAR80m W/kg body weight) [5.7] but also the expression is not good for health (on the observed expression of the body for rabbits). Especially the older generation of phone shave radiated power (in the first 5 seconds after call or listening to) is greater than the threshold limit. With the call lasted about 15 minutes, can cause bad effects to the central nervous system ( EEG expression).