This study is to determine the impact of peer education on knowledge and practice of ninth-grade girl students in Tabriz about iron deficiency and use of iron supplements. Cluster sampling method will be. Among schools, 20 schools randomized quota, selection will so that the number of samples in each school district according to population distribution in these regions is almost identical. After obtaining consent for samples, they will be given to ensure that the information obtained will remain confidential and pre-testing of samples will be taken. The schools according to scores of pre-test matched will be placed in two groups and type of education in both groups, it will be a simple randomly determined. In the group Peer education, students will ask to choose 2-3 peer educators. During two workshops for peer educators and the two sessions for direct education of students, booklet by the researcher or staff training, Brochures and pamphlets will be distributed to education. The peer educator trained, to perform the post test subjects learned and distribute pamphlets among his classmates during the hours of employment and will complete its function check list. Check list and iron, for example, after training, will be distributed. Collect the check lists and post-test, two months after the intervention will be.