This study was conducted to contribute to development of both educational materials and programs necessary to effectively teach the environmental health to the students of the middle and high schools, by analysing their understanding and attitude toward the environmental health. Also this study was carried out with 3120 male and female students of the middle and high schools in the urban and rural areas for three months from April 1 to June 30, 1996. Based on the result of this study, It is required for the related authorities, schools, experts and patents to make all their efforts, in other for the students to correctly understand the environment while this study contributes to the development of educational programs useful for effectively studying the environment and of educational materials concerning environment of the middle and high schools.