In view of the future link system integration，large-scale and complexity characteristic，The system fault diagnosis will be faced with low confidence probability of failure, low accuracy of fault location, and difficulty in recovering the combat effectiveness of the failed equipment, lack of automation, networking and intelligent fault detection, location of the integrated fault diagnosis technology. In this paper，we propose a new fault diagnosis technology that integrates multiple technical approaches， outlines the key technologies, then the new fault diagnosis technology has good characteristics such as high fault detection accuracy and high fault location accuracy. At the same time，it can meet the higher requirement of automation, networking and intelligent in the future link and other complex equipment fault diagnosis.