The Sustainable Development Goals (SDGs) of the United Nations 2030 Agenda are a key focus for implementing the Sustainable Development (SD) concept. But generally speaking, SD goals and targets are continuously evolving, country specific, complex to implement, and are often given relatively short time horizons, such as the 15-year horizon for the SDGs. Many SD issues need a much longer time horizon as the policy interventions to deal with these issues can take decades before their effects become apparent, which is especially true for China. The T21 China 2050 is developed to study the long-term SD challenges and opportunities of the country. In its business-as-usual simulation to 2050, T21 China 2050 reveals some of the sustainability challenges facing China, including 1) aging population and labor force decline, 2) huge food imports, 3) land degradation and loss of arable land, 4) water shortages, 5) huge fossil fuel imports, and 6) carbon dioxide emissions. These SD issues are a subset of the SDGs specifically relevant to China over a time horizon well beyond 2030.