Abstract: Objective To study the blood coagulation before and after total hip arthroplasty (THA) and the effect of rivaroxaban on blood coagulation after THA. Methods Sixty-six patients who underwent THA in our department in 2011 were included in this study. They began to have oral rivaroxaban on day 1 after operation and received thromboelastography (TEG) before THA and on days 1 and 4 after THA. Difference in TEG findings at different stages was compared. Results TEG showed that the coagulation reaction time(r), blood cell clot formation time(k)and coagulation time(r+k)were significantly shorter while the blood cell clot formation rate(α), maximal amplitude (ma)and coagulation index(CI)were significantly higher after THA than before THA(P ＜ 0.05). The r and r + k were significantly longer after taking rivaroxaban than before taking rivaroxaban(P ＜ 0.05). However, no significant difference was found in k,α, ma and CI before and after taking rivaroxaban. Conclusion THA can significantly increase blood coagulation and thrombosis risk. Short-term oral administration of rivaroxaban can decrease blood coagulation.