In order to improve the investment benefit and develop feasibility, the remote control unmanned water injection scheme which is improved based on the remote water injection scheme is proposed. By means of automating and remote monitoring water source well treatment system and water injection system on the platform, the scheme saves construction investment by simplifying the process, removing the water injection subsea pipeline and making water injecting platform unmanned which only needs manual inspection every 7-10 days. It is unnecessary to lay long-distance submarine pipeline for remote water injection by the technology, which greatly reduces investment and improves benefit. By remote control unmanned water injection scheme, the unmanned water injection platform is realized in a project. Without a 16.1 km subsea pipeline and relative modification works, the construction investment is saved ,the overall development income is improved, and a new method for marginal oilfield in Bohai Bay is given.