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The robust asymptotic stabilisatio of a class of nonlinear uncertai singularly perturbed systems by using nonlinear PI control techniques is presented. The original system is decomposed into t o reduced-order systems, to hich the nonlinear uncertai term belongs. I order to alleviate the deterioratio of these nonlinear uncertainties, the nonlinear PI controllers are applied to each subsystem and the results are combined to construct the composite controller of the full-order system. A example is give to illustrate the desig procedures and good performance of the proposed control scheme.