At present, plane parallel resonator is often used in multipulse laser drilling with average distribution of pulse energy. We consider it is disadvantageous in regard to accuracy, surface finishing and reproducibility for the drilled holes. Through analysis and experiments on output characteristics of resonators as well as rational distribition of pulse, energy, improvement in accuracy, surface finishing and repoducibility of the .drilled holes can be achieved, especially in improving their taper, by using false concentric resonator with changeable energy.