The N₂ back-flushing period (FT) and time (BT) were investigated in hybrid process of ceramic microfiltrationand PES (polyethersulfone) beads loaded with titanium dioxide (TiO₂) photocatalyst for advanced drinking watertreatment in viewpoints of membrane fouling resistance (R_f), permeate flux (J), and total permeate volume (V_T). As decreasingFT and increasing BT, R_f decreased and J increased, and finally the maximum V_T could be acquired at FT 10min and BT 30 sec. In FT effect experiment, treatment efficiencies of turbidity and dissolved organic matters (DOM) werethe highest at no back-flushing (NBF) because of dramatic membrane fouling. As result of BT effect, the treatment efficiencieswere the maximum at BT 30 sec, which was different with the FT result. Because the photocatalyst beads couldbe cleaned effectively as decreasing FT and increasing BT, turbidity treatment efficiency increased a little from 95.4% to97.5% as decreasing FT, and from 95.9% to 98.5% as increasing BT. Also DOM treatment efficiency increased from70.8% to 80.6% as decreasing FT, and from 75.1% to 85.8% as increasing BT. The optimal condition, where the treatmentefficiencies and V_T were the maximum, should be FT 10 min and BT 30 sec in our experimental range.