The standard parabolic equation method was obtained by the decompocition of the scalar wave equation and the expansion of the pseudo-differential operator. 通過對傳統波動方程的分解和偽微分運算元的近似展開，獲得了標準拋物線方程。
So this method is effective in soluting two-dimensional parabolic equation and can be widely used. 該方法是求解二維拋物型方程的有效方法，必將得到更廣泛的應用。
Part II, a parabolic initial boundary value problem in unbounded domains in three dimensions is studied. 第二部分，研究求解無界區域上三維拋物型方程初邊值問題的數值方法。
