Marginal oil field is difficult to develop because of low production and far distance from existing facilities. In order to solve this problem, a mobile self-installing unmanned wellhead platform which is not used in China is studied and one oilfield in Beibu Gulf of South China Sea is chosen as the target oilfield. The overall scheme, platform foundation, lifting system device selection, in-situ working condition structure analysis, towing stability and installation scheme are studied by the numerical simulation and standard verification methods. The adaptation of the mobile self-installing unmanned wellhead platform is analyzed and a new kind of engineering development plan can be provided for the reference of the chosen of engineering plans.