China has a history of 5,000 years of civilization development. Traditional Chinese medicine is one of the quintessences of China, and China medicine is a great treasure house of China's splendid civilization. Chinese children have always attached importance to health preservation and disease prevention, and many medical works have been handed down. Among them, Huangdi Neijing, which was written in the pre-Qin and Han dynasties, has the greatest influence on Chinese medicine. It is the first of the four classics of traditional medicine in China and the earliest existing medical works in China. Experts and scholars in past dynasties generally believe that Huangdi Neijing was not written by one author in one period, but by several authors for a long time. This is similar to another classic work of China, The Book of Changes. For example, Ban Gu, a historian in the Eastern Han Dynasty, suggested that the book was written at the time and the author was "three saints and three ancient histories". It can be said that these classics, which have been handed down for thousands of years, have been tested by long-term practice and are the crystallization of everyone's wisdom, which is worth inheriting and carrying forward from generation to generation.

At the beginning of Huangdi Neijing, the significance of health preservation and disease prevention was expounded, and specific methods were put forward.

"Law is based on Yin and Yang, and based on tricks", which adapts to the natural changes of Yin and Yang in heaven and earth and is reconciled in the right way.

"Eat regularly and live regularly, so as to be in harmony with the spirit." If you eat moderately and work regularly, you can keep strong physically and mentally, so you can live a long and healthy life without getting sick. This is in line with modern medicine's advocacy of balanced nutrition, regular work and rest, not being too tired, and strengthening the body's self-resistance to resist diseases.

"Under the guidance of ancient sages, it is said that fake thieves sometimes avoid it." The so-called false evil thief wind is exactly what we are facing in COVID-19 today. Today, all our epidemic prevention measures are "avoidance". Whether we wear masks at home or go out, whether we wash our hands frequently or disinfect frequently, we are all trying to avoid COVID-19. For hundreds of millions of years, human beings have been constantly dealing with various infectious diseases. After long-term practice, people have summed up a series of effective principles and methods, which are effective as long as we earnestly abide by them and make perfect use of them.

"Therefore, saints cure diseases before they are cured, and first-class doctors prevent diseases before they are cured."