Objective: To systematically evaluate the relationship between methylation of RASSF1A and breast cancer. Methods: Screening the literatures that retrieved from PubMed, Cochrane Library and Ovid. Evaluate the quality of included studies. Data analysis performed by Revman5.3 and Stata12.0 software. Results: A total of 7 articles were included in this meta-analysis, including 1485 samples. The results indicate that the positive rate of RASSF1A methylation have conspicuous difference between breast cancer and normal group, breast cancer VS benign breast lesion, as well. Respectively (BC VS N, OR=4.52, 95%CI (2.02~10.10), P=0.0002; BC VS BBL, OR=3.63, 95%CI (2.50~5.43), P=0.0002; BBL VS N, OR=0.83, 95%CI (0.53~1.30), P=0.42). Conclusion: This meta-analysis confirms that hyper-methylation of RASSF1A is closely related to breast tumor. And it is of significance in differentiating benign breast lesions from malignant breast lesions.