【Abstract】Objective To compare the efficiency and safety of high-flux hemodialysis (HFHD) and lowflux hemodialysis (LFHD) combined with hemodiafiltration (HDF) in maintenance hemodialysis (MHD) patients. Methods A total of 315 MHD patients were recruited and divided into trial group (HFHD, 3 times per week) and control group (LFHD 2 times per week and HDF once a week). They were followed up for 24 months. Results ①There were no significant differences in mortality rate (5.66% vs. 9.55%, χ2=1.701, P=0.191) and hospitalization rate (27.04% vs. 25.48%, χ2=0.100, P=0.752) between the trial group and the control group. ②The after dialysis single pool Kt/V values in the trial and control group were 1.70±1.03 and1.37±0.24 respectively (t=1.782, P=0.079), while urea reduction rates in the two groups were 75.08±13.15% and 70.31±10.69% respectively (t=1.760, P=0.082). After the treatment, serum β2 microglobulin in the trial group was significantly lower than that in the control group (21.52±9.94mg/L vs. 27.28±16.51mg/L, t=-2.148, P=0.034). ③ No dialyzer- related acute complications and dialyzer- related adverse events occurred in both groups. Conclusion The two hemodialysis methods were equally effective and safe. HFHD had a better clearance of medium macromolecular toxins and is recommended to be used clinically.