Ecological Affinity is defined in this paper as relationships conceived by human beings with their surrounding environment for sustainable development. Ecological affinity elucidates beliefs, attitudes, and intentions towards environmental sustainability expressed by human beings. This study features qualitative analyses investigating ecological affinity in the small scale of school environment of students and teachers. Two key questions were addressed in this study, i.e. how does ecological affinity appear in students' and teachers' beliefs, attitudes, and intentions in South Tangerang? How does ecological affinity of the students and teachers intersect or intercrossing? A survey was administered to teachers teaching in state senior high schools and students of the schools. Respondents participating in this study are 250 students and 43 teachers originate from 2 public schools. A descriptive analysis was conducted to explore ecological affinity and its reciprocal relations between the students and teachers. Results of the study indicate that both students and teachers show similarly their positive attitudes towards the environment (F=0.523, p=0.117, M=2,122-2,049). This performance correlates positively with their beliefs in the priority of country development (r=2.41, p=0.00). Further analyses indicated that both teachers and students showed conformity in reciprocal ecological affinity. This result was indicated by the insignificance differences between teachers and students (F=2.63 p=011). In terms of relationships between environmental beliefs and students' and teachers' attitudes towards the environment, the study found that attitudes towards the advancement of science and technologies have led to stronger intentions of students. This study recommends that more activities be shared between students and teachers regarding environmental sustainability.