The strength of concrete is an important parameter that directly affects the bearing capacity of structure, and its warp time-varying law is the basis of building the model of structural resistance variation. For concrete structure under the marine environment by environment and load combination, along with the service time, and the degradation of injury problems. This paper has collected 110 cases of 1-35 years serving in the southern Chinese coastal ports test cases, based on the experimental data of concrete, using correlation analysis and regression analysis of marine engineering concrete strength time-varying law. The correlation between the rebound method and the drilling core method is clarified, and the calculation model of the time-varying concrete strength is obtained, which provides an important reference for the safety evaluation of marine engineering concrete structures.