Base on the successful practice of platform project related to Guangzhou Shipyard International Co., Ltd., the launching system design for large-scale vessels built on horizontal berths and transported to submersible barge by grouping trolleys is discussed. By optimizing the construction technology, the bearing mode of bogies combined with trolleys provides the implementation condition for regional grouping of the trolleys, auto-even load, and three-dimensional docking for the vessel block, which improves the safety of launching operations. Compared with the sliding technique or Self-Propelled Modular Transporter (SPMT) launching technology, the launching system technology combines the advantages of the above two, which is more economical, applicable, safe and reliable. It is recommended as a preferred launching solution for large-scale vessels or similar heavy self-weight and serialized products, and it definitely will have a broad application prospect.