Objective To evaluate the anticoagulant effect of SAMe-TT₂R₂ in patients with non-valvular atrial fibrillation treated with warfarin, and to explore the correlation between SAMe-TT₂R₂ and ischemic stroke events and bleeding events. Methods Patients who were diagnosed as non-valvular atrial fibrillation and with oral warfarin were enrolled in the First Affiliated Hospital of Shihezi University School of Medical College in January 2018-January 2019, and for 10 months of follow-up. Collecting patients' International normalization ratio(INR), calculating the Time in therapeutic range(TTR), and the SAMe-TT2 R2 score. And χ² test, Spearman rank correlation and ROC curve analysis were used to evaluate the predictive ability of SAMe-TT2 R2 score on anticoagulant efficacy in patients. Follow-up was conducted to investigate the incidence of ischemic stroke or hemorrhagic events and explore the relationship with the SAMe-TT2 R2 score. Results The mean TTR of 190 patients was 46.76%±21.99%, and the score of SAMe-TT_{2 R2} was negatively correlated with the TTR of the patients(P=0.001), the area under the ROC curve was 0.661, P=0.001, The critical value corresponding was 4 points, and the sensitivity and specificity were 72.6% and 47.7%, respectively suggesting that SAMe-TT₂R₂ had certain value in predicting TTR< 65%. During follow-up, a total of 5 patients had ischemic stroke, 25 patients had different degrees of bleeding, and 11 patients had all-cause death, different SAMe-TT₂R₂ scores showed no statistical significance(P>0.05). Conclusion In patients with non-valvular atrial fibrillation treated with warfarin anticoagulant, the SAMe-TT₂R₂ score has a certain predictive ability for the anticoagulant efficacy of patients treated with warfarin anticoagulant, and the SAMe-TT₂R₂ score could be used as an indicator for predicting the anticoagulant efficacy of warfarin.