The changes of the Yundonghai wetland are analyzed.It is pointed out that the Yundonghai in Sanshui was the biggest lake in the Zhujiang Delta during the Qin and Han Dynasties.

• 分析了云东海湿地的变迁,指出在秦汉时期云东海曾是珠江三角洲最大的淡水湖泊,从明代至上个世纪末,云东海经历了由湖变田,再由田变塘的演变过程。