Most of the collected plant specimens have leaves facing upwards, and a few of them face upwards. Put it on several layers of paper that is easy to absorb water, cover it, stack the specimens layer by layer, clamp them with the specimens, tie them tightly, and put them in a cool and ventilated place. In order to prevent the specimen from moldy, it is necessary to change the paper frequently until the specimen is dry. After drying, the dried specimen is fixed on the surface paper with transparent tape, labeled, and then pasted with transparent or translucent protective paper. When collecting specimens, try to collect the seeds of roots, stems, leaves and flowers. A complete factory.