Tourism science starts with the essentials of tourism. To establish independent research and knowledge systems, a system depicting the essence of tourism activities must be developed first. Based on dialectical and phenomenological thinking, tourism can be abstracted as a movement, an experience and having the ability to change one’s potential. The relationships between travel and tourism are as follows. First, travel as a leisure product;second, travel for a leisure product;and third enjoying leisure products in travel. People take tourism as...