Abstract: It is the primary responsibility of the economic and social development of the main grain production areas to ensure the national foodsecurity.In reality,the development of rural tourism has certain impact on the food security of the main grain producing areas.According to the theory of tourism crowding out effect,based on the panel data of the main grain producing areas in the past 10 years,and with the help of Hansen threshold effect model,this paper analyzes the nonlinear impact of rural tourism on food security.It is found that when the development level of rural tourism is low,it promotes the development of food security;when the development level of rural tourism is high,it has a negative impact on the level of food security;the provinces in the main grain producing areas are in different stages of tourism development,and the impact of rural tourism on food security is different.In order to ensure the national food security,the relevant provinces should face up to the non-linear effect of rural tourism on the level of food security in regional development planning and policy-making,and reasonably regulate the development scale and speed of rural tourism,so as to promote the coordinated development and maximization of interests of regional rural tourism and foodsecurity.

Key words: main grain producing areas, rural tourism, food security, threshold panel, nonlinear impact