The purpose of "sending teachers to the countryside" is to serve "agriculture, countryside and farmers", offering courses in close connection with the actual needs of local agricultural production, carefully selecting teaching contents, implementing credit system and flexible academic system, organizing teachers from agriculture-related colleges to go out of school, running classes in the countryside and sending them to households, realizing "zero distance" between education and teaching and farmers' needs, and "zero distance" between farmers' knowledge ability and job requirements, so that farmers can obtain systematic forms of secondary vocational education.