The snake emblem originated from the story of Ascleber, a Chinese medicine god in ancient Greek legend. Legend has it that he was the son of Apollo, who was named as a medical god in 400 BC. God Ascleber is a solemn, gentle and kind doctor. He traveled around the world with a wand wrapped around the snake. Because of his superb medical skills and kindness, he is particularly popular. Later, out of reverence for doctors and snakes, snakes wrapped around crutches were used as medical marks. The wand means to travel around the world and treat people, and the snake is a symbol of health and longevity. In the west, snakes are still the symbol of medical workers. The image of snakes on the school badges of some medical schools also comes from this.

The design of "snake emblem" is an internationally accepted medical and health symbol. The emblem of the World Health Organization also uses the symbol of the snake emblem.

The cover pattern of blood donation card consists of four parts: needle snake pattern, background pattern, central peripheral pattern and outer ring pattern. It is the emblem of the Ministry of Health of the People's Republic of China. The acupuncture needle in the needle snake pattern represents the traditional medicine with a long history in China, and the snake map is based on the snake stick pattern widely used in the world to represent medical care, representing western medicine. The needle snake pattern fully embodies the health work policy of "paying equal attention to Chinese and western medicine" in China. The background pattern is a map of China, indicating that the work scope of the Ministry of Health covers the whole country and serves the health of the people of the whole country. Longitude and latitude lines mean that China's health service is an integral part of the world's medical and health services. The Great Wall with patterns on the periphery of the central government is a symbol of China, and at the same time, it embodies the health work policy of putting prevention first, which indicates that health work is a solid Great Wall to protect people's health. The olive branch represents a good ecological environment and symbolizes life, health and peace. The outer ring pattern is marked in Chinese and English by the Ministry of Health of the People's Republic of China.