Abstract: Seawater intrusion is a kind of geological disaster due to the effect of human activities associated with natural environment change. The background of geological environment is complex in Fujian coastal zones. The seawater intrusion can be divided into estuarine type, aquifer type and along fault zone type according to its ways. Finally, the paper points out to pay attention to the disaster of seawater intrusion in Fujian Province to avoid the deterioration of economic activities and the natural environment.