In Shuohuang Railway,there were two failures of the locomotive equipped with LKJ-15C train operation monitoring system(hereinafter referred to as LKJ-15C system)at the train departure station.This paper deeply studies the failure of Beidou satellite automatic driving benchmarking,and finds out the cause of the problem by analyzing records and field investigation.On this basis,a technical optimization scheme is proposed to optimize the related hardware and software logic of the Beidou satellite automatic driving benchmarking function of LKJ-15C system,so as to improve the probability of success of Beidou satellite automatic driving benchmarking.