Ganquan tofu and dried bean curd are famous throughout the ages. The production technology was invented more than 1,400 years ago. In the beginning, when the tofu was sold out, it was sliced and dried on the lid of a pot and eaten as a snack. After a long time, people said it was delicious, so they specialized in selling sliced tofu and named it dried tofu. Emperor Yang's royal visit to Ganquan, the people into the water tribute food, the first dish is naturally beautiful water tofu and dried tofu. Emperor Yang ate it and praised it frequently. For thousands of years, the people of Ganquan have been utilizing the unique resource advantage of Mishui to process tofu and dried tofu by traditional techniques, which have been passed down in the folklore. Ganquan tofu and dried bean curd used to be made from ordinary soybeans, but since the 1980s, it has been made from double green beans (green roller beans), a valuable soybean famous in Yan'an City. In the many years of practice of making tofu and dried bean curd, the people of Ganquan have summarized the eight-character dictum of "spreading rottenly, being too fine, pointing tenderly and pressing heavily". The production process of Ganquan tofu can be divided into: picking up beans, pulling soybean yellow, soaking soybean yellow, grinding soybean paste, killing foam, over the package, burning pulp, pointing brine, pressing. There is a ballad: "Ganquan tofu floating on the water, wear hanging horsetail can not rot", although this statement has an exaggerated component, but just made the tofu with a grinding rope to lift, visit friends and relatives, undamaged. At present, Ganquan has 40 individual tofu production and processing households, dried tofu production enterprises emerged "Hongli", "eight thousand miles" and other 8 manufacturers. In order to further expand and strengthen soybean products, the county will be in accordance with the construction of "specialty products," the requirements of the "five years to build a nationally renowned soybean products processing base," the ambitious goal.