Background: Breast cancer is one of non-communicable chronic diseases in women's that threaten the health of them . Then, this study aimed to determine the effectiveness of educational programs based on Stage of change Model to promote Breast self-examination behavior in those volunteers in Mashhad Iran, 2012.

  Methods: This Quasi experimental study was conducted on Two stages. The first to determine the predictive power of the model changesthe questionnaire was distributed among 410 volunteers by stratified into five city health centers.

  Then, a city health center were randomly selected and 39 of its affiliated health centers were considered as experimental and control groups. Educational programs performed for groups over four sessions. While the control group did not receive intervention.Then the questionnaire distributed among the subjects 2 months later.

  The data was collect and the results were compared. Data were analyzed using SPSS /16 software by statistical t-test, Paired t-test, Man- Whitney , Kendall test.

  Result : The means’s of age was 33 . 3±7 . 6. The Paired t -test results indicate that knowledge scores increased after the training in intervention group 's training (P<0.001,t=6.9) But this difference was not observed in the control group (P=0.64). Kendall test results indicate the intervention group during the intervention period were positive significant progress in stage of change (p=0.001).

  Conclusion: According to the results, this study had shown the effectiveness of structure of stage of change to training Breast self-examination, it seems to improve women's health this model can be used as a framework for designing educational programs .