The preservation methods of this item include adding salt to solidify and refrigeration.

1. Add salt to coagulate: Add an appropriate amount of salt to the pig blood to coagulate the pig blood. The coagulated pig blood can be stored in cold water or light salt water. The water should be submerged in the pig blood, so it can be stored for one day.

2. Refrigerator: Put the pig blood in the fresh-keeping compartment of the refrigerator, where it can be stored for three days. Or put the pig blood into a container, add water to cover the pig blood, and then put it in the refrigerator for storage.