Based on the characteristics of fuzzy network environment, this paper presents an evaluation function for traversing the target of Question of Service (QoS) in global network. In the implementation of the function, firstly, the mathematical model of the node is established, and then the limitations and adaptability of the traditional research methods in the evaluation process are analyzed. Secondly, combined with the multi-hop features of network nodes, the corresponding mechanism is given to filter the information domain. At the same time, an exponential evaluation function is introduced to eliminate the jump error caused by cumulative errors. Then it forms a set of evaluation function implementation strategy. Finally, the experimental model is constructed and the evaluation function is compared with the traditional research method. The results of three experiments show that the exponential evaluation function in this paper is deployed in the fuzzy network and each index occupies the advantage.