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In some large-scale nonlinear uncertain systems there exists a special subsystem, which possesses the maximum state dimension. By introducing a group of adjustable relation parameters (GARP), a new decentralized robust control strategy is proposed according to focus on this special subsystem. Since the GARP is adjustable, it is easy to get good performance. The controller is linear via state feedback even though the system to be controlled is nonlinear and uncertain. Furthermore, the assumptions made for controller designing are weakened in the proposed method. Finally, the simulation shows the validity.