Abstract: Due to the lack of efficient security monitoring technology, the submarine cable disruption occurs frequently caused by ship offending with hazards to the safety and stability of the cross-sea grid. For solving this problem, a safety monitoring technology for long-distance submarine cable with a good far-near complementation is proposed, which uses the integrated photo-electric radar and AIS system. First, the configuration and principle of the integrated photo-electric radar system is introduced. Then, the all-weather omni-directional safety monitoring and controlling process using this system in practical cases of the long-distance submarine cable is reported. The result shows that the submarine cables can work more safely and stably with a good performance and prospect in application by the support of this technology.