After picking the fresh osmanthus, soak it in salted alum water immediately, then put it into a plastic bag for compaction and sealing, and put it into the freezer for preservation.
Choose a sunny day, collect the freshest osmanthus on the tree, dry the osmanthus, then seal it with a plastic bag, and put the plastic bag in a jar.
Air dry osmanthus, pour maltose or white sugar into the container, then pour osmanthus, steam for 10 minutes in the pot, stir in the middle of the way, and then pour it into a clean container after it's cool, seal it and refrigerate it in the refrigerator.
Dry osmanthus in oven or microwave oven, or absorb water with quicklime, and then put it into plastic bag or glass bottle for sealing. It is suggested to use quicklime to absorb water. The dried osmanthus made by this method has strong fragrance and no big change in color.