Abstract: When many people need to be evaluated, traditional application of fuzzy synthetic decision on personnel performance evaluation will have more repetitive operation and verbose quadric treating.A new application method is proposed to deal with those problems.Evaluated object set is brought in computational process of fuzzy synthetic decision, and then all of comprehensive evaluation need can be obtained by quadric treating directly.By trial counting to all teachers' evaluations of teaching and researching performance in someone college, the proposed method can find ranking of all teachers' evaluation of teaching and researching performance by multilevel synthetic processing only once.It can overcome defects in traditional application of fuzzy synthetic decision and possess applied prospect well.