Yanchitan sheep, a specialty of Yanchi County, Ningxia, is a geographical indication product in China (geographical indication certification trademark). The unique natural geographical environment in Yanchi County has created the unique quality of Tan sheep. Its tender meat, delicious taste and even fat distribution are the highest at home and abroad. The fur produced by Ermao is white in color, pleasing to the eye in luster, beautiful in flower spike, light in wool quality, long and solid in wool, soft in root, not felt, and can be turned upside down vertically and horizontally. It is one of the "Five Treasures" in Ningxia and the first of the "Three Treasures" in Yanchi, enjoying a world-renowned reputation.