1, we know that Sophora japonica has a very strong fragrance, so in order to keep this fragrance of Sophora japonica, when selecting dried Sophora japonica, we should select some completely unopened Sophora japonica, and then carefully clean these selected Sophora japonica.

2. The washed Sophora japonica needs to be blanched in boiling water. When the color of his Sophora japonica changes, we will take it out and wring out the residual water inside.

3. Then find a clean paper or board on which you can spread Sophora japonica, and spread the soaked Sophora japonica on it to ensure that every Sophora japonica can be dried. Then when the weather is fine, put the Sophora japonica in the sun to dry. Usually, about three days in this weather is enough.

4. Find a fresh-keeping bag and put the dried Sophora japonica in the fresh-keeping bag for sealed preservation.