Abstract: An online evaluation technology for network induced time delay by redesigning the application protocol without any additional apparatus is proposed in this paper. Firstly, a computational method for network-induced time delay online evaluation and a lower bound on the transmission period are achieved by using automatic route trace technology (ARTT). Secondly, a simple decision-making for the data packet dropout is also discussed. Finally, the controller co-design is described. The effectiveness of the proposed schemes is validated by experiments.