What modern people call "the bottom of the box" generally refers to the treasure of the house, or something of certain significance that is worth cherishing or treasured at the bottom of the box, and it is also a metaphor to use all the housekeeping skills. But in ancient China, it was a proper term, referring to a sex education tool.

　　It is a kind of porcelain, some of which are smaller than fists, and the shape is mostly fruit-shaped, with a cover, and a pair of men and women are hidden in it. Usually, people put it at the bottom of the box to ward off evil spirits. Before the daughter gets married, the mother takes it out and uncovers the lid to show her the way of husband and wife. Because it is often hidden in the bottom of the bride's dowry, it is named: "the bottom of the box." In addition to the shape of fruit, it is also made into the shape of a boat, fish or doll. In addition to porcelain, there are also materials such as stone and jade. In addition to erotic porcelain, it also contains many objects related to eroticism, and many erotic pictures are embroidered on sachets, sachets or purses.

　　According to experts' research, this kind of spring painting originated in Qin and Han Dynasties. Zhang Heng, a scholar in the Han Dynasty, wrote "Singing in unison": "Re-entering the household to make a golden knot, and compete with the Chinese lights. The clothes are undressed and the powder is royal, and the picture is Chen Zhen Zhang. " The information revealed in the poem can prove that it was very common for newly married men and women to "practice" in front of spring paintings at the first night. Zhang Shi was mentioned in various books related to sex in later generations, and was regarded as an example of the ancients' emphasis on "sexual enlightenment" and "sexual education". Spring Palace paintings are paintings with the theme of sexual activities, which not only depict the process of sexual love, but also depict scenes before and after sexual intercourse, such as laughing, flirting, caressing and kissing between men and women. In addition to giving reference to others, it also has the function of helping feelings.

　　The ancient people in China did not reject spring painting, thinking that it had special functions. According to experts' research, the ancients believed that spring paintings had the function of exorcising (avoiding) evil spirits. Because of this concept, at that time, people appeared to hang spring paintings at the bedside and at the end of the stove. And why put the spring painting at the bottom of the wedding box, in addition to privacy reasons, also has the intention of ward off evil spirits, saying that when you see this painting, ghosts and gods will quietly walk away.

　　The bottom of the box also refers to a folk object of Hakka people in southern Jiangxi, which is a bamboo tube-shaped object with a unique bamboo product and a negative pole. The surface is engraved with six circles of negative lines, and four holes are drilled at both ends for hanging by ropes. This artifact is a custom handed down from the ancestral home of Hakka people in southern Jiangxi. When the daughter gets married, before the departure of the bridal sedan chair, the mother puts it under her daughter's dowry box or in the sedan chair, and mysteriously tells her daughter that hanging it on the bed or putting it in a conspicuous place after going to her husband's family can ward off evil spirits, which is said to be a kind of worship. Because it is placed under the box, it is called the bottom of the box as the name suggests.