Abstract: For the Internet-based networked control,long and uncertain time delay causes the performance of control systems to degrade quickly.It uses the Lyapunov function and linear matrix inequality to derive the stability condition and the sufficient conditions of H∞ performance criterion.It also designs and develops the Internet-based arm wrestling contest control system by socket technology.The experiments indicate that the algorithm can improve the performance of the networked control system.

Key words: uncertain time delay； networked control systems； H∞optimized control；