With the development of the Internet. People care more about the QoE (Quality of Experience)score of these services instead of the network parameter . While the QoE assessment of IPTV service based on image analysis like PNSR and VQM need full reference video to calculate the MSE with poor real time performance and also complicated .This paper had a research on the QoS to QoE mapping model based on the BPANNs，including the training and predict the QoE assessment using QoS parameter ,then verification this model. Turn out that this QoSQoE mapping model is well performed with high accuracy and fitting index.