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Sweet potato pit is a product under specific historical conditions. Bread is the pillar of life. The development history of human society is also a history of fighting hunger to some extent. In the 1960s and 1970s, like other parts of the country, there was an abnormal shortage of food in southwest Henan. After farmers who grow corn and wheat for a living complete the purchase of national public grain, there is little surplus grain left, and they can only rely on "melons and vegetables" and "miscellaneous grains" to fill their stomachs. Sweet potato (also known as sweet potato, sweet potato, sweet potato, etc. ) has the advantages of no land occupation, no fertilization, no insects, strong adaptability and high yield (average yield per mu 1000 kg). It was selected by production teams and farmers and became the staple food of farmers for half a year. Without sweet potatoes, people will starve to death. "Sweet potato noodles and sweet potato buns are inseparable from sweet potatoes."