In recent years, the G20 summit, as an important forum for cooperation, has received more and more attention from the international community. In this paper, a small corpus of 18 news texts about G20 summits published in China Daily from 2016 to 2023 is set up. Guided by the attitude system of appraisal theory, the author utilizes the positive discourse analysis and the UAM Corpus 3.3 as a corpus analysis software to analyze the attitudinal resources and the implication in the news discourse of G20 Summit in China Daily by combining qualitative and quantitative research methods. It is found that a large proportion of judgmental resources and appreciation resources in the corpus mainly convey positive discourse meanings through vocabulary and context. A large number of positive attitudinal resources have created a positive linguistic environment in the news discourse of the G20 summit, highlighting that China’s participation in the G20 summit is of great value and significance for promoting economic cooperation among countries, as well as international financial stability and sustained economic growth, and demonstrating China’s international image as a new-type of great power that adheres to the path of peaceful development.