Laoshan vermicelli is a specialty of Yinpeng Township, Guangshan County, Xinyang City, Henan Province. "Laoshan" brand vermicelli is even more famous in Guangshan and southern Henan. Detoxified sweet potato vermicelli is of high quality, resistant to cooking, bright in color and delicious. It is a green health food and is widely loved by urban and rural people. The product is in short supply.

The virus-free sweet potato industry is a pillar industry that Yinpeng Township has focused on developing in recent years. Its products, virus-free sweet potatoes and "Laoshan" brand vermicelli, are well-known in Guangshan and southern Henan. In 2011, the township's virus-free sweet potato planting area reached 13,000 acres, the fresh potato output reached 30.6 million kilograms, the number of vermicelli processing factories (households) exceeded 80, and the vermicelli production reached 2.1 million kilograms. Only the virus-free sweet potato planting and vermicelli processing were fully The per capita income in the township has increased to 900 yuan, and industrial benefits have become increasingly prominent.

Since 2004, the Yinpeng Township Party Committee and Government have held eight potato king selection competitions, building a platform for promoting potato culture, displaying potato products, promoting the potato industry, and developing the potato economy. The registered "Laoshan" vermicelli trademark has become a well-known brand in the industry in southern Henan. After years of planting and vermicelli processing experiments, the contrasting effect is very obvious. Its output is 1,000 kilograms higher than that of conventional sweet potatoes per mu. Its flour extraction rate is 2.5-4 kilograms higher than that of conventional sweet potatoes per 100 kilograms. Moreover, the quality of detoxified sweet potato vermicelli is excellent. It is resistant to cooking, bright in color and delicious in taste. It is a green health food and is widely loved by urban and rural people. The product is in short supply.