Health is the maintenance of the physical, psychological and social well-being of people and not only the absence of disease and infirmity. Health is not only related to biological factors, but also closely related to psychological and social factors. Genetic, bacterial, viral, parasitic and other biological factors can cause many diseases, and psychological and social factors can also cause many diseases, such as leukemia, cardiovascular and cerebrovascular diseases, cancer, etc. The World Health Organization has set out 10 criteria for health to measure whether a person is healthy. 1, have plenty of energy, can take up daily life and heavy work with ease, and do not feel overly nervous fatigue. 2, optimistic, positive attitude, willing to take responsibility, big and small things are happy to do, not fussy. 3, good at rest, sleep well. 4.Resilient, able to adapt to various changes in the external environment. 5.Able to resist various infectious diseases. 6.Appropriate weight, proportionate body, head, shoulder and arm position coordination when standing. 7, bright eyes, responsive, eyelids are not easily inflamed. 8.Clean teeth, no “worm teeth” (dental caries), normal color of gums, no bleeding phenomenon. 9.Hair is shiny, no dandruff. 10.Muscles are plump and skin is elastic.