Surveillance drones these days can be used to detect illegal constructions, where operators clearly see the high-rise buildings on the screen on an aerial patrol. In the early stage, some residents reported that there was illegal construction on the roof of the residential district. Because the illegal construction was located in the middle of the top floor of the high-rise residential building, law enforcement officers could not enter the roof from the top floor residents for inspection, so they sent unmanned aerial vehicles to assist the squadron to obtain evidence, through aerial survey, 14 illegal constructions are under construction in this community, and many construction materials have been accumulated on the roofs of some unit buildings, which have spread to the bearing wall of the roof, endangering the safety of the building. Law enforcement officers immediately stopped it on the spot and filed a case for the illegal construction party. Now 13 cases have been filed and 4 illegal construction sites have been taken down.