The development of the library science marks the progresses of science and culture in a country or a district. The study courses and results of a research institute are strongly reflected by its library and information work. The development of the astronomical research, the collection of astronomical observations, and the manufacture of astronomical instruments and equipments, etc., are all being made progress by library and information services to consult scientific foundation, to seek method, and to derive needed nourishment. The astronomical library and information service system is growing and expanding with continuously providing information to the astronomical study. In this paper I shall give some introductions about the Libraries and Information Divisions of astronomical observatories in our country.