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From 1960s the Institute of Electronics, Chinese Academy of Sciences (IECAS) began to study the broadband klystron. Many methods to extend bandwidth of klystron have been adopted and more than ten types of broadband klystron have been developed. Recently we have successfully broken through the bandwidth of 12% in S-band on the peak power level of 800 kW. This paper introduces the state-of-art of our S-band broadband klystron.