Abstract: Based on random field theory and the simulation method considering the Batch Production Effect, this study conducts simulations and assessments for the surface deterioration process of an in-service reinforced concrete (RC) structure in marine environment in Hong Kong. To verify the accuracy of the analysis results, they are compared with the in-situ inspection data. It is concluded that the simulation results are consistent with the realistic damage extents. Further, this study suggests that the random-field-based simulation method can provide the information on surface deterioration of marine RC structures with more measures, and in the future will guide the formulation of design schemes and maintenance strategies for other projects, and therefore help the implement of the target life-cycle performances and cost controls.