1. carton storage method. Lay a layer of paper towel on the bottom of the carton, put the sweet potato in and then lay a layer of paper towel to seal it.

2. newspaper wrapping method. Wrap the sweet potato in newspaper, and then put it all in a bag.

3. cellar preservation method. Dig a cellar artificially and put the sweet potato in the cellar for preservation.

4, drying preservation method. Slices of sweet potato can be preserved for a long time by drying in the sun.