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In this paper,a new four-dimensional autonomous hyperchaotic system is designed for generating complex chaotic signals.In the design,its parameters are selected according to the requirements for chaos and hyperchaos.The hyperchaotic nature is verified theoretically by using the bifurcation analysis and demonstrated experimentally by the implementation of an analogue electronic circuit.Moreover,the Field Programmable Gate Array(FPGA)technology is applied to implementing a continuous system in a digital form by using a chip of Altera Cyclone Ⅱ EP2C35F484C8.The digital sequence generated from the FPGA device is observed in our experimental setup.