Abstract: Objective To understande lectromagnetic radiation in tensity of 110kV high-voltage line and its influencing factors in urban area of Chongqing city.Methods According to national hygienic standard and the national standards recommendations in Manage Guide line of Protection to Radiation Environment(HJ/T10-1996),Methods of Measurement of Power Frequency Electric Field and Magnetic Field from High Voltage Overhead Power Transmission Line and Substation(DL/T988-2005),110 kV high-voltage lines close to residential buildings,streets and the different points around its vertical projection were selected as monitoring sites.The electrom agnetic radiations at monitoring site were measured 1.7m above the ground.Results With in the frequency of 5-1000 Hz,the maxmium of the electric field intensity and magnetic field intensity of each monitoring site was 1 766.68 V/m and 0.49 T and did not exceed the public exposure standard of International Commission on Non-Ionizing Radiation Protection(5kV/m,100T).The electrical field intensity at the roof near the high voltage line was 629.50-635.60 V/m and significantly higher than that at other floors of the same buildings (P<0.005).The result of electrom agnetic radiation measurement of different monitoring point under the same high-voltage line showed that the intensity at the place near the high-voltage line was 1 341.01-1 396.02V/m,much higher than that of the place far from the line(188.90-191.20 V/m,P<0.005).There were power density measurements at the sites near streets exceeding the national standard with a maximum value of 22.9 W/cm².Conclusion The mipact of electrom agnetic radiation generated by 110kv high-voltage lines in the city on residents health should beconcerned.Buildings and the way of the high-voltage line arrangement have miportant mipacts on the intensity of electrom agnetic radiation.