Abstract: The definition of network quality was presented and its connotation was expatiated for scientific evaluating network running status. The metrics were designed to reflect the network quality and the membership vector was used to compute its statistic values, the values can definitely reflect the metrics' ranks in the period of statistics. The network quality fuzzy evaluation model based on statistics was designed. The case study evaluated the four local IP networks'qualities based on their statistic values and got the quantitive evaluating results.

Key words: Network management, Quality evaluation, Membership vector, Fuzzy evaluation