Information Dissymmetry is a common phenomenon in this economical market.None of us can master all information about anything.The relative difference of the information's occupancy leads to a sharp distinction of the bargainer' status currently.During the service of our hospital library,Information Dissymmetry seriously restricts the development of our library and makes many readers dissatisfied.The author analyzed the problem in progress of service to the reader and finally put forward the countermeasure of this progress reconstruction in the hospital library.