Abstract: Unit pipes are internally coated to prevent inner corrosion, and a type of automated infrared inspection instrument is developed in order to measure the coating thickness. The paper describes the working principle of the infrared remote control system, including the transceiver. The system is based on an 80C31 sing chip computer and is featured by ARQ code correcting mode and infrared signal transmission. Because of its high error detecting and code correcting capability, the error rate is very low. In order to realize multi -function infrared remote control, large capacity 80C31 External EPROM is selected, with different programs in the EPROM. The 80C31 single chip Computer, having such advantages as small size, stable operation, high reliability, lightweight, low consumption, easy maintenance, and battery powered operation, can be interfaced with an external EPROM and used in other fields for remote comtrol.