Abstract: The paper analyzes the status quo of waters near the Gaoji Seawall based on the ocean environment monitor materials of Xiamen west and east sea area during a neap-spring tidal cycle in July, 2008 and conducts comprehensive evaluation and analysis on the ocean environment by the way of BP artificial neurology network. The result shows that the overall condition of sea water quality around east-west sea area, Tongan Bay, south-west sea area are in good condition, and the monitor indexes meet the corresponding standards, except that inorganic nitrogen and phosphate (exceptions) are over-proof. Comprehensive evaluation shows that the integrated environmental is obviously different during spring tide in both sides of the seawall, and the quality is relatively stable in the west sea of Xiamen, but it is quite different during neap tide in Tong'an Bay. If the bank is removed, the environmental tendency towards stable in west sea area is bound to be destroyed. It is suggested that we should strengthen measures on the monitor of pollutant discharged around Tong'an Bay and sensitive creature protection at the beginning of the seawall break-up.