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The BZ reaction in continuous-flow stirred tank reactor (CSTR) is selected, and the chaotic time series in low CSTR flow rates have been achieved. The power spectrum method (PSM) from physics and mathematics is introduced to compute the time delay %T%, the embedded dimension %m% so as to reconstruct the state space of the chaotic BZ reaction system by the time delayed coordinates. Further analysis and characterizations on the reconstructed chaotic attractor show that the results are in agreement with the references. It indicates that PSM is faster, simpler and reliable for processing the chaotic chemical system.