Abstract: Library is an important communal cultural institution,which plays a key role in protecting the people＇s basic cultural rights and interests,in realizing social fairness and justice,in improving the overall quality of the citizens,in promoting the construction of democracy and the rule of law,in strengthening the energy of national development,and in achieving a harmonious coexistence between man and nature.Also it plays an important role in building a socialist harmonious society.This paper discusses the role of library in building a harmonious society form four aspects,and puts forward some targeted measures to develop library cause and promote the construction of harmonious society.

Key words: harmonious society;library cause;library function;China