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For a class of similar composite systems with uncertainties, a simple optimal decentralized feedback control scheme is proposed based on model observer. It is assumed that the uncertainties exist in every subsystem and their interconnections. Also the uncertainties satisfy the matching conditions and are bounded, but the bounds are unknown. The designed controller does not depend on any of subsystem, and the model observer can compensate system dynamics with uncertainties, which can be help to simply analysis and design. The systems converge to their target precisely and quickly. The simulation results are presented to demonstrate the validity of the designed control approach in this paper.