Abstract: Due to the unreasonable design of the jumper cable between floating bodies, excessive bending, stretching and collision with floating bodies occur during operation, which affects the reliable operation of the system. In order to solve the problem of fatigue failure of trans-floating cable, a kind of floating cable is proposed floating photovoltaic multi-floating cable jumper method. Firstly, based on the structure of the floating body, the cable straddle between the typical hexagonal floating bodies is designed. Secondly, by analyzing the influence of floating body structure on the jumper scheme, the key parameters and limiting conditions of cable straddle float design are determined. A two-stage solution framework for the cable jumper scheme is established. The trust region particle swarm optimization algorithm is used to solve the jumper variable feasible domain in the first stage, and the maximum fatigue life is solved in the feasible domain in the second stage as the optimal solution. Then, the cable jumper model is built in Orcaflex software to verify the final scheme. Finally, a numerical example is given to verify the effectiveness of the proposed method. The innovative work of this paper is mainly reflected in: (1) Put forward the design process of cable span float. The cable jumper scheme is analyzed and designed based on the floating body structure, and the operation scenario of the adjacent floating body is fully considered, which saves the preparation time and reduces the difficulty of cable jumper. (2) Cosserat theory and minimum potential energy principle were used to establish the cable motion model, and the optimal crossover scheme was determined by solving the maximum fatigue life in the feasible domain of crossover variables. (3) Build floating and jumper cable models in Orcaflex software, and verify the rationality of the current scheme by analyzing the optimal cable fatigue life. (4) Through the construction of the cable model in this paper, the spatial position and bending degree of the cable can be accurately simulated, and the accuracy of the solution can be improved. (5) This paper presents a method that can solve the relationship between the length and effective span corresponding to different cable specifications, as well as the relationship between the length and height of the jumper. Similar problems can be solved through the effective range. Finally, it is verified by an example that in the range of short cable length, the outlet Angle at both ends of the cable has little influence on the height of the jumper. Beyond a certain range you need to be aware of this.