Abstract: Offshore new energy field construction investment is large, especially in the delivery system, there are also high equipment failure rate and unchanged operation and maintenance problems. In order to strike a balance between construction and operation cost and power generation reliability, several redundant configurations and submarine cable selection schemes for different delivery systems are proposed in this paper. Finally, taking an offshore wind farm in Yancheng, Jiangsu Province as a case, the cost mathematical model of the main transformer of the submarine cable and the offshore booster station is established based on the LCC theory, and the model is decomposed and calculated. By comparing the whole life cycle cost of each scheme and sensitivity analysis of key factors, the optimal configuration scheme is obtained, which provides a basis for selecting redundant configuration scheme of offshore wind power transmission system.