The effect of humic acid (HA), and the roles of microfiltration (MF), PES (polyethersulfone) beads adsorption, and photo-oxidation were investigated in hybrid process of ceramic MF and PES beads loaded with titanium dioxide (TiO₂) photocatalyst for advanced drinking water treatment. The results of water and nitrogen back-flushing were compared in viewpoints of membrane fouling resistance (R_f), permeate flux (J), and total permeate volume (V_T). Because membrane fouling increased dramatically as increasing HA, R_f increased and J decreased, and finally V_T was the highest at 2 mg/L HA. Average turbidity treatment efficiencies were almost same independent of HA concentration. Average organic matter treatment efficiency was the minimum 71.4% at 10 mg/L HA in water back-flushing, but those were almost constant in nitrogen back-flushing. The hybrid process of MF, PES beads, and UV (MF + TiO₂ + UV) have the lowest R_f, and the highest J and V_T in both water and nitrogen back-flushing. The turbidity and organic matter treatment efficiencies were the maximum at MF + TiO₂ + UV independent of water and nitrogen back-flushing, and decreased sequently as simplifying the process to MF. However, adsorption performed the more important role than photo-oxidation in water back-flushing, and photo-oxidation was the more than adsorption in nitrogen back-flushing.