Keshan County, Heilongjiang Province, known as the "Pearl of Black Soil", is located in the northeast of Heilongjiang Province, China, with fertile black soil. It is one of the main agricultural products bases in China and the hometown of potatoes. The main varieties of Keshan potato are Heifeng and Huangmazi. Because of its big size, good taste and high starch content, it is deeply loved by consumers and has become the first choice for many vegetable wholesalers and retailers.