Objectives: This research intends to evaluate the effect of peer support on self efficacy level in type II diabetics. Peer support can link people sharing experiences to provide the practical, emotional, and ongoing support to control patients’ sustained behavior changes. Design: This study is a randomized clinical trial with pretest - posttest and control group. Methods: A convenient sample of 80 patients with diabetes are selected from the diabetes clinic Shahid Choobkar in Chamran Hospital, A branch of Lorestan University of Medical Sciences. These people who have the required conditions to participate in the study, The group was divided randomly into two equal groups of 40 persons (experimental and control). The major eligibility criteria: They include the age (above 30), a primary literacy, the lack of physical limitations for self-care. with a medical profile in the diabetes clinic, having a history of diabetes type 2 at least for one year, having sufficient time to participle in the group sessions. The major outcome criteria: The Lack of mental health and physical health relating to the age that may hinder the learning, such as memory problems, Alzheimer's, etc. The use of the medicines that affect the consciousness and learning levels. The affection to other known chronic diseases such as kidney, autoimmunization diseases etc. Based on the patients’ own statements, medical and paramedical educations, the intention of immigration during the study and the background of similar study participation. Interventions: After preparing peers, the participants in the intervention group in the selected center was supported by their peers in face to face meetings for 3 following months (10 sessions of 2 hours) whit Instructional content is defined in relation to the identification diabetes, types of diabetes, risk factors, complications, treatment and control, the role of diet, exercise, Self-monitoring of blood glucose and medications to control diabetes by group discussions, asking and answering sessions and sharing their personal experiences and success on the diabetes disease control. In the end of the period, the pedagogical pamphlets Was presented to the group, whereas the control group received only routine care(such as the periodical doctor visits and pedagogical classes...). The main outcome: Self efficacy level in both intervention and control groups was measured before and three months after the intervention.