Abstract: Alarge-scale sea aggression along the coast of the Bohai Sea in north China occurred at the Christian era.Signals of the sea aggression were recorded in,an ancient Chinese classic writhed in the end of lst century.which revealed that a“massive sea spill”had developed there in 48BC,and after 2 A.D.extensive sea aggression occurred Using the ancient Chinese documents,we conclude that after sea aggression,The coast line remained stable for one and a half centuries,but from the 4th to the 7th century.the coast line receded gradually.

Key words: sea aggression,environmental changes,Bohai Bay,christian era