---

Background: Cervical cancer is the most common malignancy among women. Unlike most cancers, cervical cancer is avoidable the early detection of this cancer is done by a test called Pap Smear. Most cases of this cancer are found among women who haven't done this test. The aim of this study is to examine   effect of educational program based on HBM Model on the practice of women about Pap smear. Methods: This survey is a quasi –experimental study that was done on 124 women live in khomeinishahr city that   randomatically place into two case and control groups. The necessary information was collected with a researcher – planned questionnaire which was designed based on reliable sources. The questionnaire was designed in four different parts Demographic details, Practice. Knowledge and Model sections. Questionnaire was filled out by the two groups pre and post of intervention. For analyzed of data was used SPSS software and paired T-test, Independent T-test   and chi-square test were used. Findings: At the post test, Women in experimental group had significantly higher scores on knowledge (P<.001) perceived susceptibility (P<.001), perceived severity (P<.001) perceived benefits (P<.001) and perceived barriers (P<.001) as well as taking health action (pap smear) (P<.001) Conclusion: The finding of this study support the feasibility of the educational program based on HBM to improvement practice of women about Pap smear.