Abstract: A method of decentralized open-loop transfer recovery is proposed for uncertainly interconnected large-scale systems, which is based on the H∞ theory and decentralized state observers. The existence of those observers which satisfies the requirement for the recovery matrix H∞-norm, is given. Based on the block-diagnal singular value decomposition to the interconnections of the large-scale systems, we proved that the decentralized observer gain matrix can be obtained by solving Riccati equations, and open-loop recovery difference matrix satisfies the requirement. The decentralized open-loop transfer recovery is then realized. The experiment results show that the control performance of the decentralized open-loop transfer recovery are similar to that of the decentralized state feedback.