1. The custom of Tomb-Sweeping Day has absorbed a series of customs and sports activities, such as swinging, cuju, polo and willow insertion, in its historical development.

2. The custom of sweeping graves to worship ancestors in Tomb-Sweeping Day has existed since ancient times. Even in today's society, people still have the custom of sweeping graves around Tomb-Sweeping Day to pay homage to their ancestors: pulling weeds, offering sacrifices, burning incense and praying in front of graves, burning paper money and gold ingots, or simply offering a bunch of flowers in memory of their ancestors.