The liquid level accurate control of multiple water tanks system has become a research focus due to the nonlinear process and multiple variables. The experimental platform of multiple water tanks system is designed based on the network control systems-4000 (NCS4000) in order to study and implement the advanced PID control for this system. The mathematical model of the system is established. Finally the Lyapunov approach is used to design the PID controller for the multiple water tanks system. Therefore the experiments proved the effectively and accuracy of the PID control method for the liquid level control of platform.