On the basis of the stage changes of the influencing factors of tourism development,the index system of influencing factors of tourism development in the high-quality development stage is constructed,and the spatial differentiation causes of tourism development level in...MORE On the basis of the stage changes of the influencing factors of tourism development,the index system of influencing factors of tourism development in the high-quality development stage is constructed,and the spatial differentiation causes of tourism development level in the Yellow River Basin of China in 2019 are explore...