Introduction: Breast and cervical cancer is the most common cancer and the main cause of cancer death in women. Cancer screening is based to Prevention and early detection. The aim of this study was the survey of Prevalence of breast and Cervical Cancer screening behavior and related factors in woman who refereeing to health center of Sanandaj city. Methods: This descriptive-analytical study was carried out on 250 over 20-years old women's referring to Health Centers in 2014 years which were recruited with a Cluster sampling method. Data was collected through a Researcher made questionnaire. The validity and reliability of the questionnaire using Cronbach's alpha coefficient was 0/85. Data was analyzed by SPSS16 software. Results: The mean age of participants was 36 years. 207 participants (82.8%) were married and the level of education in 65 women was diploma. 196 women in this study was housekeeper. The percentage of screening tests including self-examination, clinical examination, mammography and Pap smear consequently were 13.6%, 4.8%, 9.6% and 7.2%. The most important factors affecting screening tests in this study was age, educational level, job, marital status and history of problem and history of cancer in the family. Conclusion: The breast and cervical cancer screening tests was less than expected in the study population. Regarding the factors affecting these tests need to pay more attention to the programs that will improve the level of screening behaviors.