In order to overcome sensitive defects of components deviations and environment defects in

analog circuit design, a novel four-dimensional hyperchaotic systems is constructed based on Lü system.

Basic nonlinear dynamics characteristics are analyzed to the new system. By optimizing the design of

sampling frequency selection, gain adjustments, parameter configuration etc., the hyperchaotic circuit runs

stably while the signal amplitude is reasonably controlled. Curves of the digital chaotic sequence show

smooth without jagged shape. The circuit can be applied to other digital realization of chaotic systems with

commonality and expandability. Its experimental results fully consistent with phase space structures of the

continuous chaotic system, which shows the development of chaotic systems based on FPGA is feasible

and practical.