School is a platform for the growth of the children. A teacher play a crucial role in forming the behaviour of the children. Behavioural problem includes disorders that represent significant deviation from the normal behaviour. The root of the problem usually traceable ath the home or school environment. Behavioural problems of school children can be managed and controlled by teachers. They can control it only if they have proper and significant knowledge regarding behavioural problems among school children.The study was undertaken with the general objective of study the awareness of primary school teachers on the behavioural problems of the school children in Ernakulam district. Specific objectives of the study are to know awareness of primary school teachers about symptoms and cause of behavioural problems among school children, to study socio demographic profile of primary school teachers, to study the awareness of primary school teachers about management of behavioural problem of school children and to study the awareness of most effective treatment for behavioural problems. The descriptive method of research was used to evaluate the primary school teachers awareness about behavioural problem of school children. In view of the nature of the problem and to accomplish the objectives of the study a structured questionnaire was prepared and administrated to 60 primary school teachers between 1- 7th standard from 10 primary school selected from seven taluk in Ernakulam district which include both private and government school on simple random technique. The present study revealed that behavioural problems are more common in school aged children and teachers had considerably moderate awareness regarding behavioural problems. So enhancement the awareness of behavioural problems is necessary.