Abstract: The coastal hydrogeological environment is a main environment in which saline intrusion easily occurs. For investigation of the environment a combined method of macroscopic system analysis and microscopic contradictory factors analysis was used.Saline intusion disaster in Guangrao County resulted from vulnerability of the natural environment and deterioration of the social-economical environment of the studied area. The essence of the whole process of saline intrusion lies in the destruction and reconstruction of the balance between the motive force and the resistance of saline intrusion. The basic contradictions causing environment deterioration in the area of saline intrusion.the are analyzed and the scheme for hydrogeological environment regulation as an effective measure for saline intrusion disaster prevention is worked out.