Yiyang, Hunan Province is the birthplace of preserved eggs. According to historical records, it has a history of more than 500 years since the beginning of Ming Dynasty. Yuanzhou District, Yichun City, Jiangxi Province is an important producer of preserved eggs, while preserved eggs in Nanchong, Sichuan Province are more distinctive. The preserved eggs of Guizhou Songtao originated in Xia Dynasty.

Preserved eggs: also known as preserved eggs, preserved eggs, and gray-wrapped eggs. , is a traditional egg product in China. The main raw material is duck egg, which tastes fresh, smooth and refreshing, and has good color and fragrance. Preserved eggs are not only loved by domestic consumers, but also enjoy a good reputation in the international market. After a special processing method, preserved eggs will become black and bright, with white patterns on them and a special aroma, which is one of the people's favorite foods.