Abstract: Similar structure for a class of generalized interconnected systems with nonlinear interconnections is defined based on derivative output feedback and restricted system equivalence in this paper,so a new aspect for similarity research is presented here.There are uncertainties that do not satisfy the matching conditions in the interconnections.Derivative output feedback robust decentralized controllers are designed so that the interconnected system is asymptotically stable at its balance point.Since the controllers also possess similar structures,they are easy to be implemented in engineering.