Abstract: The input and output formed by tourism investment operation is an important topic in tourism economics research. The research of this topic is guided by the theory of socialist market economy, aiming at the tourism economy, and based on the in-depth analysis of tourism industry investment in many cases, it is concluded that the input and output patterns between tourism industries are related to different tourism factors, so as to make an objective and scientific evaluation of tourism economic activities. Tourism is the conclusion of "small investment, quick effect and high income", which is not a general economic phenomenon, its economic characteristics or the law of tourism economy. It is just suitable for scientific tourism investment, and an ideal input-output model can be established under this condition. Therefore, it is impossible to "understand" and "use" the so-called "economic law" keywords, such as tourism investment, input-output and capital movement. The development mode of tourism has a history of 100 years in the world. Today, it has become the largest industrial sector in the world, and it has contributed to the economic and social development of many countries and regions in the world. Tourism has become an important field of economic sector and tourism academic research. Among them, the input and output of tourism is one of the important research topics concerned by academia and industry. Especially in China, tourism started late and faced with a lot of investment and operation. Therefore, the study of this issue is not only of great theoretical significance, but also of great practical significance to guide our future tourism investment practice. Past experience and lessons tell us that we should calmly and objectively observe and analyze a series of phenomena in the operation of tourism input and output, as well as their relations and problems, before we can draw a correct conclusion.