In the ancient period, Chinese people often used mirrors to ward off evil. However, Chinese people used the pots full of water to reflect their face until mirrors were invented. In the beginning, this kind of pot was used to be a sacrificial utensils. The ancient Chinese people thought the water of the pot could ward off evil. For this reason, as the mirrors were invented to replace the pots, the ancient Chinese also take it for granted to use mirrors to ward off evil.