采用脉冲分割模型详细研究了任意空间和时间分布波形的激光通过任意增益分布脉冲激光放大器后，激光脉冲波形和能量密度的变化，并将可用总损耗Ｔ表示的集中损耗近似和薄片损耗模型计算结果作了比较，给出了集中损耗近似成立的条件。 The pulse-splitting model is used to study the changes of laser pulse waveform and energy density after the laser of any spatial and time distribution waveform is passed through an arbitrary gain distribution pulse laser amplifier. The calculation results of the central loss and the loss model are given by the total loss T After comparison, the conditions for the approximate establishment of centralized loss are given.