Container ro-ro ships are a newly emerging composite multi-purpose ship type that combines the functions of container ships and ro-ro ships. They combine the advantages and characteristics of container ships and ro-ro ships. In addition to loading containers and ro-ro cargo, you can also load designated special cargo, such as aircraft parts, large transformers, large mechanical parts, etc. The 45000-ton container ro-ro ship developed by Hudonghua uses integrated advanced technology combining CFD calculation and ship model test research, as well as finite element analysis of hull structure and strength for calculation or evaluation analysis, and formulates corresponding design and process solutions. It has successfully overcome the overall functional planning and design of ro-ro area and container area, the design and optimization of bulbless bow line, and the design and construction of the transition area between container and ro-ro cargo structure. The design and construction of thin plate large-span single-row column structures, a series of key technologies such as the design and construction of hatchless, non-binding, and continuous ultra-high guide rail frames. Compared with the previous generation G3 container ro-ro ships, the developed ship type has greatly improved its performance indicators, and its characteristics and advantages are more prominent. It is mainly reflected in the following: 1. The container loading capacity has doubled, and the ro-ro loading capacity has increased by 50%;2. Through the cooperation of ultra-long guide rails and light rainproof covers, the entire ship has no binding of containers;3. Equipped with a desulfurization washing tower, the sulfur emission index has been reduced from 3.5% to 0.1%, meeting the third-stage requirements stipulated by MARPOL; 4. It is equipped with an efficient and energy-saving integrated rudder and propeller propulsion system, which improves propulsion efficiency by about 2%;5. It adopts a number of advanced energy-saving and environmentally friendly designs to meet the RINA& ldquo;GREEN PLUS& rdquo; green environmental protection classification symbol. The ship's innovative design and construction in terms of capacity, economy and environmental protection won the Innovation Award at the 2016 Global Ferry Shipping Conference. The main technical innovations of this ship type are as follows: 1. Through the innovative design of the functional planning of the ro-ro area and the container area, the container loading volume and ro-ro loading capacity are maximized. 2. Using integrated advanced technology combining CFD calculations and ship model test research, excellent ship types with excellent rapidity, seakeeping, controllability, energy conservation and emission reduction performance have been developed. 3. Through hull structure optimization and full-ship finite element analysis, a special arc transition design is adopted to break through the structural design problem of stress concentration in the transition area of container and roll-on connection. 4. The first large-span single-row column design for thin plates in the ro-ro area not only solves the problem of large-span construction deformation of thin plates, but also maximizes the effective cargo area and the convenience of operation and loading in the ro-ro area. 5. The first container fixing design without hatch cover, no binding, and continuous ultra-high guide rail frame has greatly improved loading efficiency, reduced the labor intensity of terminal workers, and improved the efficiency and efficiency of ship operations. 6. It has overcome many technical problems in ship manufacturing and effectively ensured the ultra-high precision requirements for the construction of this type of ship. 7. The project has applied for and accepted 23 patents and authorized 18, including 7 invention patents and published 13 papers. The 45000-ton container ro-ro ship is the world's largest and most advanced G4 multi-ro ship type that Hudong Zhonghua can independently design and batch build. The design and construction of this project have filled a domestic gap and significantly improved the technical level of China's shipbuilding industry. It has played a huge role in promoting the transformation and upgrading of the shipbuilding industry structure from conventional ship types to high-tech, high value-added high-quality ship types. This achievement can also be expanded and applied to large amphibious assault ships, landing ships, dual-use transport ships, ro-ro ships or PCTC and other ship types. The results have a wide range of applications. The output value created by a 45000-ton container ro-ro ship is equivalent to four 76000-ton bulk carriers. Based on an annual output of 5 ships, the annual output value will increase by about 2.8 billion yuan, with significant economic and social benefits.