The research on Ardeidae of the Luo Yang Bay mangrove wet land from 1999 to 2002 shows that there are 11 species of Ardeidae birds which belong to 7 genera respectively. The Bubulcus ibis is a new kind of birds found in this area.Annual fluctuation of the Ardeidae population is shown in details. The reason of the change is also given in the article.
