Abstract: In order to understand the distribution and influence factors of chloride ions in the marine concrete structures in service, typical berths serving for different time periods in the Lianyungang port were sampled and the chloride ions in the marine concrete structures located in different regions were detected to find the influences of exposure zone, and the impacts of soaking time, locations and directions, cracking state and maintenance history on the chloride ions concentration of the marine concrete were analyzed in this study. The analysis results show that the accumulation rate of the chloride concentration in the concrete structures placed in the water level fluctuation zone is the fastest, which is larger than that in the atmospheric zone, and it increases with the increase of the elevation; the chloride ions mass fraction at the cracking position is obviously larger than that at the uncracked position in the same environment; the chloride ions' ingression rate is also influenced by the orientation which accepts the different illumination time, the peak value of the chloride ions mass fraction of the concrete to the sea side appears in the concrete cover, while the peak value of the chloride ions mass fraction of the back sea side appears in the concrete deep layer. The chloride ions in the concrete will transport from the inner to the surface when the surface layer of the concrete is repaired, which will make the peak value of the chloride profile appear at a certain depth of the concrete specimen.