The voltage controlled magnetic switching effect is verified experimentally.The Landau-Lifshitz-Gilbert (LLG) equation is used to study the voltage controlled magnetic switching.It is found that the initial values of magnetic moment components are critical for the switching effect,which should satisfy a definite condition.The exteal magnetic field which affects only the oscillation period should be comparable to the inteal magnetic field.If the exteal magnetic field is too small,the switching effect will disappear.The precessions of mx and my are the best for the tilt angle of the exteal magnetic field θt ＝ 0°,i.e.,the field is perpendicular to the sample plane.