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用变时间步长有限差分法对液状多孔制品在真空冷冻干燥过程中的Fick分子扩散传质时的升华问题进行了求解，理论和实验结果比较表明，变时间步长有限差分解简单、直观，具有较高的准确性。
The time-varying finite difference method was used to solve the sublimation problem of Fick molecular diffusion mass transfer of liquid porous products in vacuum freeze-drying process. The comparison of theoretical and experimental results shows that the finite difference solution with variable time step is simple and intuitive, With high accuracy.