| With the development of economic globalization and the growth of world trade, containerization of each country is becoming intensive and large-size and the ULCS is needed urgently in the world market. This paper will study key structure technology of 9618 TEU container ship on the basis of ULCS which is being developed by MARIC. The goal is to develop the self-determination technique which it is also useful for our country to strengthen our building power and improve the design ability.Due to ULCS's characteristic of big open, high speed, high request on stability, large deformations of hatch corner and high proportion use on high-tensile steel, hull girder and fatigue strength are very important to ULCS.As to 9618TEU ULCS, the transverse open scale is near to 90%. Therefore only considering the vertical hull girder force component is not sufficient to decide the required hull girder strength. The bending moment of still water, the torsion induced by cargo and unsymmetrical tank arrangement, wave torsion induced by oblique wave encounter and the horizontal bending moments should be also included in the hull girder strength calculation.First, DNV software is used to do rule calculation for midship section in this paper, and we can resize dimension properly through careful comparison to gain a more economical optimization structure. Second, FEA (finite element analysis) is used to do cargo hold analysis according to the rule and to verify whether the transverse members can satisfy the yield and buckling standard and the design and material can be reasonable. Then, global hull analysis is done to find the distribution of hull girder stress and the high stress areas which bear dynamic loads. The results can provide boundary condition for fine mesh element analysis, and it is also the basis of fatigue assessment. Finally, fatigue assessment for the typical longitudinal frame connections is done to test whether the structure has enough fatigue strength and fatigue life.
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