Firstly,it briefly introduces the from and distribution of the secondhand books market and researched the sources, the prices of the secondhand books, including the whole process of book purchasing, evaluating and vending.

The effect of flotation parameters such as flotation consistency,temperature,flotation time,air to pulp ratio,turbulence level(velocity of pulp flow),and pH on domestic old book paper deinking efficiency was studied by using a high-consistency laboratory pulper and a laboratory deinking cell developed by ourselves.

This paper introduces the necessity of rejecting old-books in university library, analyzes the principle and scope of the rejection of old-books, expounds the implementing methods for rejecting old-books, and probes into the treatment of the rejected old-books.

This paper discusses on the important significance of the rejection of old-books from the storage of university library, and probes into how to do well the rejection of old-books from the storage of the library from aspects of determining the principle and scope of the rejection, selecting the methods of the rejection, and the problems needing attention in the rejection, etc.