Cyber Physical Systems (CPS) is a new science to joint physical and computation together and it can be used in information technology, industry process control and other fields. But its model remains a new research field that needs to be explored. In this paper, we put forward a novel CPS model based on Cognitive Network (CN) and accomplished the combination of CPS and CN. The model was composed of four layers included physical layer, network layer, user layer and cross layer. We discussed every layer in our model in which the functions such as control, communication and so on were described. We also presented the feedback circle in cross layer detailedly. Finally, we explained the suggestion and future work briefly.