Sanlizhuang According to official website's inquiry, the sanhe city Municipal Government and Sanlizhuang Village are new fruit and vegetable bases integrating fruit and vegetable, catering, leisure and tourism. The operation mode of "cooperative+farmer" and "picking+sightseeing" is adopted, and the flow of people is large, with the peak on weekends and holidays, with more than 200 people a day at most. People flow is a survey method, which records the number of people passing through a certain place in a certain period of time. This is a synchronous observation method, which provides direct data for future market analysis and market forecast.