Objective: Analyze genotype distributions of MTHFR and MTRR in Han nationality women of Qionghai city.Methods: This study included 1166 Han nationality women.Collected their oral epithelial cells to extract genome DNA for detecting SNPs of MTHFR and MTRR with fluorescence quantitative PCR.And then compared the distribution frequency of MTHFR and MTRR with data of other cities.Results: The frequencies of MTHFR C677T in Qionghai women are significantly different from that of Weifang,Zhengzhou,Deyang and Zhenj...