A radiated power measurement system was constructed by using ulra-widehand antenna and digitalradio frequeney wattmeter. The radiated power of communieation devices including smart phone , wireless router ,teleeommunication base station ,ete, which are quite common in daily life was measured and analyzed.and their eleetromagnetie radiation pattem eharacteristies and attenuation laws with distance were explored. There search results show that the radiated power generated by wireless deviees will alenuate rapidly as the distance inereases, The radiated power is close to the environment level when the mobile phone is 20 em awavand the wireless router is 2 m away. The issue of the negative impact on human body by eleetro magneticradiation is fually considered in the design of wireless communication equipment ,and the major absorption bandof human body is avoided, Finally, several suggestions are put forward to avoid the inlluenee from radioirequeney radiation as much as possible.