1, morphology: the cocoon pupa's form is like a spindle, divided into head, thorax and abdomen. After the completion of spitting silk, its body color will change to yellowish brown or brown, pupal skin will also become hard. The pupa, on the other hand, is made by the domestic silkworm after completing the fifth age, through the spitting of silk in the cocoon metamorphosis, oval or ovate in shape, the body surface of the particles are clear, the size of each body node is the same, in a ring-shaped arrangement.

2, the growth process: cocoon pupa in the completion of spitting silk into the pupal stage, after a certain period of time will hatch into adults. The pupa is metamorphosed from artificially bred domestic silkworms, so it is easier for people to observe and study.

3, nutritional value: cocoon pupa and silkworm pupa have high nutritional value, rich in protein, fat, carbohydrates, minerals and vitamins and other nutrients. However, cocoon pupa also has the effect of nourishing yin and tonifying the kidney, strengthening the spleen and eliminating thirst, and is considered a good tonic.