The work aims to integrate ethnic cultural elements into the ethnic tourism culture APP to meet the increasing emotional needs of users in travel experience. The content and interface of ethnic tourism culture APP were designed and studied by AHP and orthogonal test. Firstly, the content orientation and pre-selected content of ethnic tourism culture APP design were determined according to the characteristics of the scenic spot, and the analytic hierarchy process was used for optimization and screening. Secondly, on the basis of optimizing the content, the interface of national tourism culture APP was designed. Then, an orthogonal table was established according to the characteristics of scenic spot and interface design and the quantitative evaluation of potential users' emotional needs was analyzed at the same time. Finally, the optimal design scheme was determined. By combining the characteristics of scenic spot, ethnic cultural elements and users' emotional needs, multi-angle and multi-level analysis and design were carried out on the content and interface of ethnic tourism culture APP. With the APP design of grassland scenic spot in Saihantala Resort as an example, it provided a brand-new design idea for the national tourism culture APP. Combining ethnic tourism culture and users' emotional experience and determining the design elements from the user's perspective can make the design of APP more humanized, and also provide a new theoretical basis for the design of ethnic tourism culture APP in the future.