Breast cancer is one of the most prevalent cancers in women .Early diagnosis has an effective role in treatment and if self-examination is periodically performed, the mortality rate will decrease. This study aimed at assessing Knowledge, attitude and performance of Hams women toward the breast cancer. In this descriptive analytic study, 264 women (20 years old and over) were chosen by a clustered multi-stage method. The questionnaire included individual information, knowledge questions, attitude phrases, questions about performances and would be completed through interview.In this research, 57/3% of the cases had poor Knowledge, 64% had Positive attitudes and 35% self Examination were performed and, 56% were of performed self-examination of which %56 were of ill-action.There was a significant correlation between literacy, history of education about breast cancer, source of information and knowledge level (P<0.05).There was also a significant correlation between age, marital status, History of education about breast cancer, and attitude (P<0.05).Finally, a significant correlation was seen between literacy, cancer education, and women (P<0.05). There was also a significant correlation among women's action, knowledge and attitude(p=000)Considering the correlation between public attitude and that the more the women were aware, the more self examinations were performed ,helpful measures are recommended to promote women's awareness.