Abstract: Through the analysis of classification technique of Web request, It is we found that a lot of information to classify is needed, so the realization of QoS policy is complex. In this paper, we put forward a new classification system of Web QoS based on PKI, it adopted PKI technique to reform the access security characteristic of Web server. We realized the binding between user's certificate and Qos policy with the use of Web Qos policy server. It makes the QoS policy realize easily. Therefore the demand of network user can be met better.