In order to optimize the design of multi-beam survey lines to ensure the accuracy and efficiency of the coverage area of survey lines in seabed surveying and mapping, this paper adopts the methods of numerical combination, analytic geometry, recursive algorithm, and approximate triangulation processing. On the basis of ensuring the continuity and progression of the model, parameters such as slope foot and the opening Angle of multi-beam transducer are designed to establish the optimization model of multi-beam survey lines under different conditions. After analysis and testing, it is believed that the above model established in this paper can be applied to ocean exploration and research, such as exploring ocean topography, and has a high degree of practicability.