Abstract: Recently more and more children＇s digital libraries emergy with the various types of digital libraries spring up. This paper tries to take some primary children＇s digital libraries in the U.S. as examples to explore the four aspects of the construction of children＇s digital library： the subject ,the design of interface ,the participators and the interaction.

Key words: Digital Library, Children＇s Digital Library,Targets of Library, Design of Interface,Interdynamism