To assess the durability status and remaining service life of existing concrete dock located at Beibu Gulf, the propagation phase was evaluated based on the in situ test data and concrete cover corrosion-crack model. The results indicate that the propagation phase will last about 2.09-22.77 years based on eight deterministic models. The empirical values of 2-5 years, recommended by scholars and engineers, would be more reasonable when the RC structures were exposed to harsh corrosion environment. According to the probabilistic model, the uncertainty of limit crack width and time-dependent characteristic of the corrosion rate were taken into considered, the propagation phase equated to 12.7 years, which was fitted with the deterministic models. The limit crack width and corrosion rate significantly affect the assessment of the propagation phase. When the value of corrosion rate increases from 0.5 to 1.0 μA/cm², the value of the propagation phase decreases by 14.75 %; and the value of the propagation phase increases by 39.13 % when the value of limit crack width rises from 0.15 to 0.50 mm. The study shows that the tested concrete dock can meet the requirement of design service life.