Abstract: This paper designs an application scheme of IAP technology based on ARM7 core aduc7024 as the main control chip in the monitoring sub-station remote upgrade program, from IAP principle, Bootloader design and detailed design of the secondary interrupt mapping principle. At the same time, in order to monitor the safety and error correction capability of the remote upgrade procedure of the substation, the power failure data protection and error tolerance are designed by the software to ensure the stability and correctness of the remote online update of the monitoring substation program.