This study examines the investigation of the information processing behaviours of secondary level science teachers. It is based on the data collected from 50 secondary level school science teachers working in Kathmandy valley. The simple random sampling and the Cognitive Style Inventory have been used respectively as the technique and tool to collect the data. The results indicate that the secondary level science teachers possess three types of information processing behaviours, namely, split cognitive style, undifferentiated cognitive style and integrated cognitive style. It has also been found that there exists a difference in cognitive behaviours of science teachers based on the variation in their type of schools while there is no significant difference in information processing behaviours based on type the of activities, qualification, instructional method used and their castes.