Under the background of the global digital economy，mobile applications（App）digital products are going overseas rapidly. So the penetration and decline rate of App digital products in the international market are studied. Considering the important influence of users on the international market penetration and internationalization process of App digital products，based on the value co creation theory of user participation，a model with the penetration rate of the target country as the explanatory variable and the user participation and user user interaction as the adjusting variables is constructed. On the basis of the theoretical model，the relationship between the penetration rate of App digital products in the target country and the recession rate，user participation and user interaction is empirically analyzed and verified. The regression results show that the faster the penetration rate of App digital products in the target country，the faster the decline rate. User participation and interaction between users can ease the relationship between the two，thereby extending the life cycle of App digital products and maintaining their popularity. Sustainability of international markets. Based on this，further researches and summarizes the cyclical iterative mechanism to improve the sustainability of App digital products，and proposes the management strategy for App digital products to go overseas，providing reference for relevant research on App digital products going overseas.