National image is an important concept in international marketing field, and destination image is an important concept in tourism field. In the increasingly competitive globalized market, the national image and destination image present important strategic value for the product and tourist destination to obtain a competitive advantage. However, there are few empirical studies on this relationship. Based on a comprehensive review of the latest research progress in the two fields, this paper analyzes the definition of the two concepts and the feature of the dimensions and proposes a model of tourism intentions that integrates these variables and the corresponding five assumptions. It is found that the national image can not only significantly affect the cognitive image of the destination, but also significantly affect the emotional image, but the influence on the cognitive image is greater than the influence on the emotional image，the overall image perception of potential tourist destinations significantly affects their tourism intentions, and the influence of national image on the tourism intentions of potential tourists is completely mediated by the destination image.