The Indonesian government implements Adiwiyata program in some schools to improve the next generation character of environmental caring. An important component of the Adiwiyata program is an environment-based curriculum that focuses on environmental management and protection. Some schools still face on the challenges of this curriculum and some have worked on it well. This study aims to explore the implementation of environment-based curriculum at an Independent Adiwiyata State Primary School in Yogyakarta. This is a qualitative study involving principals, teachers, committees, and students. The data was collected through in-depth interviews and observations. Then, the collected data was analyzed using Miles and Huberman qualitative analysis. This study shows that: (1) the implementation of environmental education is integrated to the national curriculum (K-13); (2) the environmental materials for each grade refers to the Outline of The Material Content or GBIM; (3) students are directly involved in the environmental activities through learning, extracurricular and habituation; (4) the environmentally-friendly facilities are used in the implementation of education; and (5) school establishes partnerships with various parties to support curriculum achievement. These findings can bring practical benefits as it can help the school to evaluate the curriculum, inspire other Adiwiyata schools by the principles found in this study. Besides, it also helpful for further researchers who concern on environment-based curriculum.