There are strong ultraviolet rays，lack of oxygen and large temperature difference in the areas with high altitude and extremely cold climate． The safety of electric power operators is difficult to be guaranteed and even life － threatening in such a harsh environment． A wearable safety guarantee system is designed and implemented，which uses smart watch to detect the physiological characteristics of human body． The wireless wearable gateway is used as the environment monitoring and data communication center to centrally manage the wearable device information and exchange the remote data with the background server． The system can perform real － time monitoring，health warning and safety management of the working environment and physical signs of operators．