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In the field of information security, chaos algorithm and its application in hardware encryption have important significance. The paper here takes a normally used Lorenz chaotic system as an example and introduces its FPGA hardware circuit design; generation and download method, then, statistical tests and instrument test are done. Through the test, it is demonstrated that the chaotic sequence generated by the circuit has good statistical properties and chaotic characteristics. By this way, researchers can easily and quickly get and test chaotic sequences in experimental environment.