对高功率激光多程放大系统中脉冲强度的三维时空变化特性进行了详细的数值分析,理论计算表明具有一定时空分布的光束在放大过程中会产生复杂的时空演化畸变,给脉冲功率的整形预测带来了一定的难度.提出了输入输出积分能量曲线拟合的方法,实现对多程放大系统输入脉冲波形的高精度反演预测,对于方波和复杂多台阶波形输出都能得到很好的预测结果,方波预测相对功率偏差低于0.032%,三台阶脉冲相对功率偏差为0.78%,另外还实现了更为复杂Haan脉冲的反演预测,相对功率偏差为0.13%.该方法不仅精度高,而且计算快速、适用性很强. The numerical analysis of the three-dimensional spatiotemporal variation of the pulse intensity in a high-power laser multi-path amplification system is carried out. The theoretical calculation shows that the beam with a certain space-time distribution will produce complex temporal and spatial distortion during the amplification, Brings a certain degree of difficulty.It puts forward a method of curve fitting of input and output integral energy to realize the high accuracy inversion prediction of the input pulse waveform of the multi-path amplification system, which can be very good for the output of the square wave and complex multi-step waveforms The prediction results show that the relative power deviation of the square wave prediction is less than 0.032%, the relative power deviation of the three step pulses is 0.78%, and the inversion of the more complex Haan pulse is also achieved, with a relative power deviation of 0.13%. This method not only has high accuracy , But also calculated quickly, applicability is very strong.