In view of the lack of design method for the main structure of port engineering with a design service life greater than 50 years,the contents such as the standard value of action and the quantitative design of durability involved in the design are systematically studied.The port engineering that can improve the design service life and the corresponding structural reliability level are clarified.The probability analysis method is used to determine the adjustment coefficient of the design service life of the action standard value,and the determination methods for the action standard value such as the stacking load,lifting and transportation machinery load,and wave forces and so on are proposed.Based on the chloride ion diffusion theory and carbonation model,a quantitative design method for the durability of concrete structures in seawater environment and freshwater carbonation environment is proposed,including the definition of structural durability limit state,the check formula of service life and the calculation method of deflection after corrosion.The research shows that through the reasonable determination of the standard value of the port engineering structure and the quantitative design of the durability,the port engineering structures with a design service life of more than 50 years can reach the same reliability level as the current 50-year standard.The research results provide technical support and engineering application basis for the structural design of long-life port engineering.