提出了基于H_∞范数的系统降阶准则,并且利用遗传算法实现了基于该准则的系统降阶。这一方法的提出避免了传统方法的缺点,降阶系统达到了非常理想的性能。通过例子表明,该降阶方法优于目前普遍使用的其它降阶方法。 A system reduction criterion based on H_∞ norm is proposed. The system reduction based on this criterion is realized by genetic algorithm. The proposed method to avoid the shortcomings of the traditional methods, reduced order system to achieve a very good performance. The example shows that the reduction method is superior to the other reduction methods commonly used at present.