The god of plague, also known as the messenger of five disasters, is the god of plague in ancient Chinese folklore, that is, Zhang in spring, Liu Yuanda in summer, the clock in autumn and winter, and the legendary evil god who can spread the plague. It is also a metaphor for evil and disgusting people or evil forces. The evil god who spreads the plague. Plague, or simply plague, fever or epidemic disease in ancient times, is an acute infectious disease. In ancient times, people's wisdom was not open and medical conditions were poor. People were so afraid of this terrible disease that it was easy to think that ghosts and gods were at work. Therefore, begging for divine protection is an early act. Every family in ancient times had the custom of hanging "wormwood" on their doors, so that the plague would not come in.