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This paper studies the problem of designing Hinfin controllers for networked control systems (NCSs) with both network-induced time delay and packet dropout by using active varying sampling period method, where the sampling period switches in a finite set. The newly proposed active varying sampling period method can ensure the sufficient use of network bandwidth. A multi-objective optimization methodology in terms of LMIs is proposed to deal with the problem of Hinfin controller design for NCSs with active varying sampling period, and the parameter uncertainty-based method is also adopted for Hinfin controller design. The simulation results illustrate the effectiveness of the proposed parameter uncertainty-based Hinfin controller design.