In millisecond blasting

the delay error of detonators can result in possible superposition of vibration induced by separate blasting; and causing transnormal particle velocity. Especially in large scale millisecond blasting

the superposition of blasting vibration can not be ignored. By using genetic algorithm

this problem is studied; and the maximal possible magnification factor of blasting vibration after superposition induced by the delay error of detonators can be obtained. The index of magnification factor can be used to evaluate the hazard of detonators’ delay error so as to offer a reference for the blasting network design and vibration control in engineering blasting.