Abstract:Sea (salt) water intrusion in Shandong province are mainly composed of four types, they are planar type, ribbon type, vein type and leaky type. Climate, topography, geology, hydrogeology and storm are natural elments which caused sea (salt) water intrusion; while other human factors, such as over[CD*2]exploitation of underground water, construction of water storage in upstream, the development of mariculture, expansion of salt field, sand excavation and coastal construction projects are major elements which induced sea (salt) water intrusion. It is put forward that engineering countermeasures and non[CD*2]engineering countermeasures are two kinds of mehtods for protecting sea (salt) water intrusion.