利用超强激光脉冲中分子与场相互作用的多电子态模型，数值模拟了分子波包在高低频超强激光场中的演化过程。结果发现，高频场中分子波包的扩展是渐进的，直到脉冲作用结束，分子才完全离解；而在低频场中，分子波包迅速隧穿到离解态，仅在脉冲的前几个周期，波包便溢出相互作用区。另外还比较了高低频场作用下分子的离解几率和离解碎片的动量分布。 The evolution of molecular wave packet in the high and low frequency superlattice field is simulated numerically using the multi-electron state model of molecular-field interactions in the superlattice laser pulse. The results show that the expansion of the molecular wave packet in the high frequency field is gradual, until the pulse action ends, the molecules completely dissociate; while in the low frequency field, the molecular wave packet tunnels rapidly to the dissociation state, only in the first few cycles of the pulse , The wave packet will overflow the interaction area. In addition, the dissociation probability and the momentum distribution of dissociated fragments under high and low frequency fields were also compared.