With the rapid development of national helicopter technology and the opening of China's low-altitude field, all parts of the country began to liberalize the flight policy of helicopters and their aircraft in low-altitude field. Chengdu is no exception, and it is also open, so there are helicopters flying over Chengdu. However, ultra-low altitude flight is strictly controlled within the allowable range. If you want to fly at ultra-low altitude, you must also declare air traffic control permission, and you must not fly without authorization.