Abstract: The performance of campus networks involves many factors, including some non-quantitative ones, which result in the subjectivity and uncertainty in the network performance evaluation. Based on the fuzzy theory and its comprehensive evaluation, a model of network performance evaluation is presented by using the fuzzy relationship composition principle. The fuzzy dividing line between each factor and its divisors is measured by using the subordination degree; the fuzzy evaluation matrix is constructed according to the parameter of network performance index and evaluation grade; and the transformation theory of the fuzzy assemblage is employed to make a multi-calculation so as to decide the grade of the evaluated object.