The present gaper describes some interesting phenomera discovered in the Similar Chua's Circuit. First of all it looks briefly at the circuit structure and state equation and then determines the chaotic behavior from the property of the eigenvalue according to Shilnikov theorem. Some valuable results are obtained by experiments and spectrum analysis, i. e., period doubling leads to chaos from the equilibrium and it obeys the law of period-chaos-peried plus 1. Finally, the paper offers a numerical range leading to chaos from Hopf bifurcation when parameter G is changed.