Abstract: In order to solve the problems that the operation stability of equipment board decreases and fault location is difficult with the increase of operation years of power grid optical transport network (OTN), combined with the daily work plan, this paper deeply studies the methods to improve the operation stability of OTN network, and puts forward a way to quickly and effectively locate the fault location, which greatly ensures the reliability of business operation. The application practice shows that this method can guide the subsequent service channel switching, ensure the stable operation of OTN transmission network, and provide a reliable communication channel for the company's digital power grid construction.