Yun'an County is located on the southern edge of the Tropic of Cancer. It has a low latitude and is close to the ocean. It is a subtropical humid monsoon climate. The temperature difference between day and night in the hilly area is large, which effectively promotes the expansion of the fruit, which is beneficial to the degradation of chlorophyll in the peel and plays an important role in the accumulation of nutrients and carotenoids. It forms the characteristics of Nanshengsha sugar orange, which is premature, tender and juicy, with crispy flesh, sweet taste and bright fruit.

The appearance of the yuba is bright and lustrous, and it is light yellow; the taste is pure, sweet and fragrant, no smell, good toughness, chewy, non-sticky after water swelling, especially in the same kind of products. The protein content is as high as 48.8%, the fat content is 25.1%, and cholesterol and saturated fat are very low. It also contains trace elements such as sugar, iron, calcium, phosphorus, and thiamine, riboflavin, and niacin. Because it contains phytonutrients, it is called "the most vegetarian".

Yun'an is a key county for sericulture production in Guangdong Province. The county has a long history of mulberry sericulture. The “Yunan silkworm cocoon” has a significant improvement in quality, with good senses, high rate of squatting, high cleanliness and high unwinding rate. It has a white appearance, natural luster, and less clothing, and is well-proportioned. It is popular in Hong Kong and Macao, as well as in Shaoguan, Guangzhou, Zhuhai, Shenzhen, Foshan, etc., and has a high reputation in the neighboring provinces.