Aiming at the Chua circuit, this paper proposed three methods to change the component parameters within a reasonable range, which can remain the chaotic dynamics unchanged, based on the circuit equations theoretically, and carried out circuit simulation experiments with Multisim. Comparing the spectrum distribution of each circuit variables derived from the different conditions, we can find that the simulation experimental results agree with the theoretical analysis. This result can provide a design proposal for chaotic circuits that have special frequency requirements, and can improve frequency characteristics of chaotic system by selecting different component parameter within a reasonable range.