Behaviors of three egrets were observed by using instantaneous scanning sampling method from January to March of 2004 at Beili Bay of Dongfang City,Hainan Island.In daytime Grey Heron always rest and stand on the mudflats,and seldom feeding.Little Egret prefer to feeding than standing,and Great Egret often stand,sometime feeding.The frequency of feeding for the three Egret is 40%－60% for Little Egret,20%－40% for Great Egret,and less than 0.1% for Grey Heron.The difference of feeding strategy of the three egrets was discussed in this paper.