It refers to urban medical workers taking turns to go to the countryside in stages and in batches, going deep into farmers' homes or fields to provide medical treatment to farmers who lack medical care and medicine. This is a normal situation that the Ministry of Health organized medical workers across the country to carry out after Chairman Mao put forward the instruction to focus medical and health care in rural areas on June 26, 1965 (referred to as the "626 Instruction") in response to the backwardness of rural medical and health care. activities. To this day, itinerant medical treatment is still continued in some areas.