Abstract: In order to improve the accuracy and operational efficiency of submarine cable pre-construction sea sweeping measurement, and to ensure the safety of laying in complex sea environment, this paper adopts the multi-sensor cooperative sensing system and intelligent path optimization method, constructs a complete technical process covering data acquisition, fusion processing and obstacle identification, and carries out a field validation study in the Rudong test sea area. The results show that the optimization mode has significant improvement in target recognition rate, path coverage integrity, operational efficiency and risk control compared with the traditional mode, and has good engineering adaptability and promotion value.