Abstract-The main substation and transmission line inspection are using artificial inspection nowadays, especially under harsh operating environments and mountain difficult, the effect is not very satisfactory. But the number of helicopters is a limited ,about 1~2times every year. While the research and design of remote control aircraft based on DTMF technology will greatly solves these problems. This paper gives the system design, software systems, hardware systems and mechanical parts design, then introduces the codec in the remote system application methods to achieve substations and transmission lines for the purpose of inspection airship.