Reinforced concrete members are the main components in the structure of ports.Studying the component in service after a period of time has important practical significance to study the distribution features of the concrete strength and time-changing law in service after a period of time.Based on a large number of concrete strength testing data,we study the concrete strength for the type of probability distribution by W-test,which verifies the feasibility of using normal distribution,and gives the referential values of concrete strength by various test methods.Based on the real-measured data on the concrete strength of different number of years,we get the relationship between the concrete strength values of rebound method and service life by regression analysis method.