Determination of the nature of agricultural tourism is beneficial to development of agricultural tourism, optimization of rural industrial structure, and improvement of ecological environment, which are effective ways to increase farmers' income. In this paper we takes tourists as the starting point and destination of agricultural tourism, and by means of interviews, surveys, content analysis and grounded theory, we found that, first, agricultural environment, agricultural production activities and agricultural culture are regarded as tourist attractions; second, different tourists have different understandings of agricultural tourism, and different types, like sightseeing, life experience, cultural education, physical and mental pleasure, and pursuit of happiness have been developed; third, agricultural tourism can be defined as tourists' pursuit of happiness or other goals in agricultural life, relying on agricultural environment, agricultural culture and other attractions, and achieving a state of physical and mental freedom in different places through sightseeing, life experience and other activities.