Abstract: To study the association between green tea consumption and the risk of breast cancer by conducting Meta analysis. Using the key words, tea polyphenol, tea, in combination with breast cancer, databases of the Medline, Pubmed, Embase, CNKI and WANFANG from January 1996 to December 2011 were searched. The analysis of merging effect value and homogeneity were performed by using RevMan software, and the funnel plot and the Egger’s test were adopted to examine the potential publication bias. A total of ten studies met the inclusion criteria and were included, with breast cancer cases number of 12144. Compared the highest consumption group with the lowest consumption group, green tea consumption significantly reduced the breast cancer risk by 18% (pooled OR=0.82, 95%CI: 0.68-0.99; I2=74%, P<0.001), the result also had statistical significance (pooled OR=0.76, 95%CI: 0.59-0.96; I2=80%, P<0.001) when data from case-control studies were pooled, but there was no significance association when cohort studies were pooled (pooled OR=0.97, 95%CI: 0.80-1.18; I2=18%, P=0.30). Therefore, green tea consumption may reduce the risk of breast cancer in women, and the related research evidence is limited to some extent now yet.