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In this paper, by applying a group of specific orthogonal wavelet packet to Eykhoffalgorithm, a new impulse response identification algorithm based on varying scale orthogonal WPTis provided. In comparison to Eykhoff algorithm, the new algorithm has better practicability andwider application range. Simulation results show that the proposed impulse response identificationalgorithm can be applied to both deterministic and random systems, and is of higher identificationprecision, stronger anti-noise interference ability and better system dynamic tracking property.