Based on the traditional technology and the practice, some key links of pottery masks such as clay selection, filter processing, drying and baking are presented.

通过向传统学习和基于实践，论述了陶土的选择、过滤、加工、干燥与烧成等土陶脸谱烧制的几个重要工艺环节。

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Hexi Reservoir Project, applying filter design, is introduced, which is made up of clay central core and sandy gravel dam according to the gradation curve of clay and gravel.

介绍了合溪水库工程的概况，选用坝型为粘土心墙砂砾石坝，根据粘土和砂砾石料场的颗分曲线，对反滤料进行了设计。

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