此方法能改善微扰计算处理，有利于讨论解的时间行为，并得到某些新的结果。
This method can improve that of perturbation calculation, benefit discussing time behavior of solution, and get some new results.
常用的计算自由能的方法有热力学微扰法及热力学微积分法等。
The usual means of computing free energy are thermodynamic perturbation, thermodynamic differentiation and etc.
利用直接微扰法，给出了该系统的一级近似波函数及能谱随时间的演化规律。
This model is solved by applying the direct perturbation method. The time evolution of spectrum and the first order approximate wave function for the system are presented.
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