Tomb-Sweeping Day, also known as Walking Festival, Walking Festival, March Festival, ancestor worship festival, etc., is celebrated at the turn of mid-spring and late spring. Tomb-Sweeping Day, which originated from the ancestors' belief and the custom of spring worship, is the most grand festival of ancestor worship for the Chinese nation. Tomb-Sweeping Day has two connotations of nature and humanity, which are both natural solar terms and traditional festivals. Grave-sweeping and outing are two major themes of Tomb-Sweeping Day, which have been passed down since ancient times in China. Tomb-Sweeping Day is a traditional major spring festival. Grave-sweeping and ancestor-remembering is a fine tradition of the Chinese nation since ancient times, which is not only conducive to promoting filial piety and family memory, but also promoting the cohesion of family members and even the nation. Tomb-Sweeping Day's integration of natural solar terms and humanistic customs is a combination of human and natural conditions, which fully embodies the idea that the ancestors of the Chinese nation pursued the harmony of "heaven, earth and people", and paid attention to adapting to the right time and place and following the laws of nature.