The uncoordinated design of FACTS devices with excitation systems may deteriorate robustness of the power system. Based on STATCOM and excitation system controllers model of a Multiple Input Multiple Output (MIMO) system．The design method of a nonlinear control technique, named zero dynamics is given in the paper to design the controllers of PSS and STATCOM. The power system is simulated respectively at the instance of coordinated and uncoordinated design the controllers of PSS and STATCOM by DigsiLent/Powerfactory. Simulations results clearly verify that the zero dynamics method both improves dynamic stability and performance of the power system with wind generation．