With the development of computer technology and network, fully exploiting of the trust relationship between network users become hot spots among network operator platforms. A method of user trust degree evaluation model constructing with user attribute information as evolution index is proposed in the article. Also,the paper focuses on how to use the analytic hierarchy process(AHP) to determine the weight of each evaluation index to mitigation of human subjective factors. On the basis of introducing the AHP, the weight of the evaluation index in the user trust evaluation model is given. Also the application of AHP makes the model more scientific, simpleand effective.