Sea(salt)water intrusion is a global problem. As showed by a lot of datas, different levels sea salt water intrusion have happened in human living areas. Salt water intrusionhas happened in south bank of Laizhou bay. It is showed that the saltwater intrusion interface has been gradually migrated southward. It will seriously influence normal use of the groundwater resource. Monitoring of saltwater intrusion has great significance in reasonable use of groundwater resources in this area. In this paper, monitoring method system of salt water intrusion in south bank of Laizhou Bay has been set up.