The study used the method of case study to find out how the research subject- an elementary school director of general affairs could have acquired prior knowledge, experiences and capabilities in planning out a sustainable campus, what actions related to the construction on campus he had taken, and what ideas and practices of sustainability had been implemented by him. This director's efforts on campus sustainability made his school win national-level recognition and awards. We carried out in-depth interviews, documents collection and cross-validation by key persons to collect the information, which was then analyzed through comparison, summarization and contrast. The results obtained are as follows: 1. The director's growth environment, site work experience, and environmental enlightenment cultivated his prior knowledge, experience and capabilities in building a sustainable campus. 2. He applied positively what he had learned to build the campus, paid attention to work and care for subordinates when leading his team, and truly achieved revenue and cut expenditure to increase funding for the construction on campus. 3. His idea is to emphasize on resource integration and effective use, in order to consume the least amount of energy and resources, to minimize the impact on the environment, and to achieve the best teaching results. His practice has the following characteristics: (1) it is problem-solving oriented; (2) it saves the cost, in line with the economy; (3) it adds creativity and artistic imagery to campus space; (4) it meets the educational, safety, and humane planning; (5) it combines both ecology and local resources with instruction. Finally, suggestions made are hopefully helpful for school teachers engaging in campus sustainability and environmental education.