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A new circuit unit for the analysis and the synthesis of the chaotic behaviours in a fractional-order Liu system is proposed in this paper.Based on the approximation theory of fractional-order operator,an electronic circuit is designed to describe the dynamic behaviours of the fractional-order Liu system with a=0.9.The results between simulation and experiment are in good agreement with each other,thereby proving that the chaos exists indeed in the fractional-order Liu system.