Recently, the State Grid Gansu Electric Power Company for the first time the UAV technology applied to 750 kV transmission line live operations, greatly reducing the risk of live operations. On the same day, on the second line of the 750 kV East Railway Station, a six-rotor UAV carrying insulated rope smoothly flew under the command of a pilot of Gansu Electricity Maintenance Company. When arriving at a predetermined position, the carrying insulated rope was thrown off. Ground personnel will be hanging insulated rope and 3 12 mm diameter insulated wire suspended in the phase conductor, of which two insulated rope suspension ladder, a root for equipotential backup operator protection. When the equipotential bonding system is good for the backup protection rope and the working person in charge is allowed, the worker enters the strong electric field along the insulation ladder and hangs the potential transfer rod for eliminating and eliminating defects. After 15 minutes of work, the defects are eliminated smoothly. This innovative work method avoids the process of climbing tower, alignment and insulator, and increases the safe distance of workers several times, reduces the safety risk, reduces the number of workers and equipment and greatly improves the work efficiency. The operation broke the conventional strong electric field into the law to solve the domestic 750 kV single-circuit transmission line in the phase due to lack of safety long-term unable to carry out the problem of live work. The technology by the Gansu Electric Power Company employees independent research, in solving the remote control signal interference by a number of problems such as the strong electric field, and ultimately determine the implementation of the program. Observed by the scene of technical experts, this method of operation is very convenient, with a small safety risk, the use of small appliances, less staff, simple operation, has a good promotion prospects, making 750 kV transmission line live operations from the " personal skills era "into the" UAV mechanical age. "