Abstract: Inland encroachment by salt seawater over Laizhou Bay area makes serious endan-germents. Scientific calculation resulting from a great quantity of meteorological dada sets have shown that about 15 billion tons of cloud water resource can be used for precipitation enhancement from March to October every year over Laizhou Bay area. For example, more than 0.9-1.2 billion tons of cloud water resource can be increased by artificial enhancement for stratus clouds and 7. 5 billion tons for cumulus cloud. So, the cloud water resource is considered to be rich over Laizhou Bay area. Precipitation enhancement by cloud seeding is a very significant and efficient way to increase the surface precipitation, to raise the subterranean water level, and to keep salt seawater from intrusion.