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With the rapid development of mobile network, APP has become an important platform for children to acquire knowledge, entertainment and learning. Environmental education APPs have great potential to cultivate children's environmental awareness with the feature of “edutainment” and “fun”, as well as to stimulate their interest in learning and change their behavioral habits. Starting from children's UI and UX design, we use creative and child-friendly design to enhance the attractiveness of the product and the user's adhesion. Through quantitative research, we investigate the market and user needs, and analyze competitors. Through qualitative research, we analyze the content of the product using educational psychology as a starting point. The main motivation of this study is to enhance children's interest in environmental protection and their sense of social responsibility through game- based teaching, in view of the environmental problems in Macao and the world.