Staff of Zhongshan Power Supply Petrol used the UAVs (unmanned aerial vehicle) to check iron towers and make line patrolling in Banfu on 11th April. This is the first time the staffs carry out the line-patrolling of UAVs on the spot after their training, and the UAVs successfully finished related work within 15 to 20 minutes, which is much more efficient and safer than the manpower work.