The design of decentralized robust H∞ state feedback controller for large-scale interconnected systems with value bounded uncertainties existing in the state, control input and interconnected matrices was investigated.Based on the bounded real lemma a sufficient condition for the existence of a decentralized robust H∞ state feedback controller was derived. This condition is expressed as the feasibility problem of a certain nonlinear matrix inequality.The controller, which makes the closed-loop large-scale system robust stable and satisfies the given H∞ performance, is obtained by the offered homotopy iterative linear matrix inequality method. A numerical example is given to demonstrate the effectiveness of the proposed method.