Abstract:Seawater intrusion interface division in coastal area has great significance. Within the scope of seawater intrusion, due to high salt content of underground water, it can not be used in industrial production, human and animal life, but deep sea water can bring high value in marine aquaculture. By using highdensity electrical method and controlled source audio magnetotelluric method, seawater intrusion interface between shallow seawater and deep seawater has been accurately divided. According to electrical characteristics, seawater intrusion characteristics which is from shallow to deep has been analyzed and studied, and rock breaking and waterrich regularity in different depth has been predicated. It will provide some references for carrying out coastal aquacultur by using deep intrusion seawater with higher temperature.