Result: The number of postoperative VTE patient accounting for 0, 6% in LMWH group (146/25479), which was higher than the figure of rivaroxaban group of 0, 3% (15/4531) and the proportion of patients developing VTE in 90 days after hospital discharge of the LMWH group was 0, 5% (138/25479), compared to rivaroxaban group with percentage of 0, 3% (14/4531). The rate of developing bleeding complications were higher in LMWH prophylactic group with 6, 2% (1585/25479) in comparison with rivaroxaban group with 4, 5% (206/4531).