As after-ripening, storage of tea after a certain period of time, the quality will be improved, the value also increased.

Compared with other kinds of tea, Pu 'er tea can be stored for longer. Due to the post-maturing action, its quality improves with time.

Postharvest fruits are still alive, fruit ripening and softening is a complicated development course of physiological and biochemical changes, and it is regulated by cell wall degrading enzymes.