Abroad, it can be divided into three stages: First, before the 1960s, the process of tourism activities was mainly studied from the perspective of economics. 2. From the mid-1960s to the end of 1980s, tourism research entered a stage of all-round development. Thirdly, after the 1990s, the focus of research began to tilt to the non-economic field, with the aim of studying how to make tourism and tourism develop healthily and continuously. As for China, my inductive ability is not good, so I can't help you.