Abstract: With the in-depth development of the Bohai Oilfield, the proportion of marginal oilfield development projects has gradually increased. More and more marginal oilfields with low productivity and poor efficiency need to be put in service. The use of frequency converters to remotely control submarine wellhead electric submersible pumps is an effective way to upgrade the yield and adapt to the annual production allocation. It is necessary for marginal oilfields to build a new platform to control the power transmission of several surrounding wellheads due to their large dispersion ranges and long distances. The traditional three-core submarine cable connecting the supporting platform and the newly built platform can no longer meet the variable frequency drive requirements among the wellheads. At present, the commissioning of the multi-core wet structure bundle submarine cable is an effective way to realize the application of unmanned platforms, concentrate on the development of multiple oil wells, reduce construction costs, and decrease environmental pollution. The feasibility of localization of bundle submarine cables in terms of system composition, key technologies and solutions, accessory design, production technology and comprehensive testing are elaborated, and suggestions and considerations are proposed for the wider application of bundle submarine cables in offshore oil and gas development in the future.