Abstract: Objective To investigate the level and characteristics of electrom agnetic radiation and its influence factors in residential environments of Chongqing city.Methods According to the national hygienic standard and national recommecdations in《Manage Guideline of Protect to Radiation Environment》(HJ/T10-1996),four residential communities and a college were selected randomly.The outdoor electrom agnetic radiations were measured 1.7 m above the ground.Results The maximum values of general electric field streng that five communities were 3.77V/m and 4.35 V/m and with in the national first grade standards for safe area lim its of 100 KHz-800 MHz and 700 MHz-3 GHz in electrom agnetic radiation.There were several values of composite power density at two conmunities exceeding the national standard with the maximum of 22.9μW/cm² and 20μW/cm².Conclusion High voltage electrical wire,environm ental greening,building materials,building layout and the layout of various power lines have important impacts on the level of electromagnetic radiation in living environment and the situation needs to be studied further.