Abstract:: Onboard recorder is playing on a critical equipment, with large storage capacity, small size, high reliability, and its storage module compared to other storage modules have higher reliability. This paper briefly introduces the methods of work about onboard recorder and memory module.In terms of memory module exists problems on reliability, optimized design from software include the transfer of work state and recognition of instruction of memory module, and the asynchronous serial communication application in memory module, monitoring the working state of memory module. Compared with before, the memory module work more flexible and reliable.#$NLKeywords: reliability; Alternate page programming; Serial communication; Condition monitoring