The competition among the university library is fundamentally intense gradually. The methoud to raise the competition ability of the university library lies in introducing the staff and training the staff. Only the stuff's performance are raised, can the university library be developed prosperously. The performance management of the staff is the basis to make the university library policy and carry on the important decision of the university library, which is also an important mechanism for the university library to set up the strategic targets. This ariticle introduces the principal component to judge the performance of the the staff of the university library, which can give the university library a useful result to introducing the highly efficient staff and training the low outstanding staff. Through enstablishing the appraisal model, the university library can get the stituation of the staff performance eassily, then they can take on some effective measures to raise the level of the staff performance so that the university library can be developed effectively and efficiently.