采用拟谱法和劈裂算符法，数值模拟了脉冲激光场与氢原子系统相互作用液化过程。当输入激光场为正弦波形式时，氢原子电子的拉比振荡波形为正弦波; 当输入激光场为调幅场时，其拉比振荡波形为方波，但 存在较严重的布居泄露;当对氢原子外加限制势时，在保证拉比振荡为方波的前提下，可以通过降低激光场的强度来减少布居泄露， 达到完全布居传输的目的。

Using the splitting-operator spectral method, the evolution of interaction of the pulse laser with hydrogen atom system was stimulated. The result indicates that when the input laser pulse is sine waves, the Rabi oscillation is also sine waves. When the input laser pulse is amplitude-modulated pulse, the Rabi oscillation will be of square waves, but there exists serious population-leak. Besides, when the hydrogen system is under a confined potential energy, the laser intension can be decreased to decrease the population-leak and achieve complete population transfer.