This study aims to explore the information seeking behavior of junior high school teachers of biology in their teaching context. Semi-structured interview data of five teachers was collected and analyzed using the qualitative approach. Research results show that the teaching process of biology teachers exhibits the following ten behavioral characteristics, namely, (1) defining, (2) understanding, (3) collecting, (4) selecting, (5) organizing, (6) transforming, (7) instructing, (8) evaluating, (9) reflecting and (10) modifying. It was also found that biology teachers' pedagogical knowledge plays an important role in their processing of information. That is, taking into consideration the teaching goals, students' characteristics and teaching contexts, the biology teachers would organize and transform their subject knowledge into the instructional representation. Teaching evaluation and reflection would also be the basis of further instructional modification. Finally, this study makes some suggestions for the design of information systems in school libraries.