The "bibliotherapy" is very strange term to the library circle in Taiwan Area out ithas been used in library literature early since world war I and has been widely applied in the1930s by the public libraries in the United States for reader service. But why has the bibliotherapy that is related with readrs' of their public service? What isthe background of its historical development? What are its theoretical guidelines andapplication scopes? What kinds of its important plans have been carried out and how are theachievements and results? What has been its development ever since its appliance in the1930s? All these are questions worth studying. This paper aims to study and analyze the above-mentioned questions and introduce to thedomestic library circles the state-of-art of the appliance of the bibliotherapy for readersservice of the part of libraries in the United States.