Abstract:Due to seawater intrusion along Beijiaolai river in Pindu city, industrial and agricultural production and peoples' living have been damaged seriously. Through survey and analysis on present condition and characteristics of seawater intrusion along Beijiaolai river, pointing to the evolution characteristics of seawater intrusion, the origin of seawater intrusion and its damage have been analyzed, and relative protection countermeasures have been put forward as well.