The composite string structure of riser pipe-cement ring-surface casing has considerable bearing capacity. This part of the rich bearing capacity is used to bear the jacket platform load through the load transfer technology, which can optimize the size of the pile legs and the depth of mud, and reduce the cost of platform construction. This paper proposes a method of transferring the jacket platform load to the composite pipe string structure of riser pipe-cement ring-surface casing to improve the carrying capacity of the jacket platform. The interaction mechanism between the jacket platform and the riser composite pipe string structure is analyzed, and the load transfer efficiency calculation model when the riser composite pipe string structure and the jacket platform are rigidly connected and the ultimate bearing capacity of the riser composite pipe string structure are established. Force calculation model. Taking the typical six legged platform in Bohai Sea as an example, the analysis shows that the load transfer method can transfer 12.5% of the load of the jacket platform to the composite pipe string structure while ensuring the strength and stability of the pipe string structure, reducing the depth of the jacket platform pile pipe into the mud It provides theoretical guidance for the structural optimization design and simplified construction of the jacket platform.