The effects of pH and oxygen back-flushing were investigated in hybrid process of ceramic microfiltration and PES (polyethersulfone) beads loaded with titanium dioxide (TiO₂) photocatalyst for advanced drinking water treatment in viewpoints of membrane fouling resistance (R_f), permeate flux (J), and total permeate volume (V_T). As increasing pH, R_f decreased and J increased. Finally the maximum V_T could be acquired at pH 9. Treatment efficiencies of turbidity was almost same independent of pH. Treatment efficiency of dissolved organic matters (DOM) decreased as increasing pH. As results of comparing the oxygen and nitrogen back-flushing, R_f,180 at oxygen back-flushing was the lower than that at nitrogen back-flushing, and the dimensionless final permeate flux (J₁₈₀/J₀) by initial permeate flux (J₀) at oxygen back-flushing was maintained the higher than that at nitrogen back-flushing except 10 and 12 min of back-flushing period (FT). Treatment efficiency of turbidity at oxygen back-flushing was a little higher than that at nitrogen back-flushing. Treatment efficiency of the DOM at nitrogen back-flushing was the higher than that at oxygen back-flushing. Also, treatment efficiency of turbidity at saturated oxygen was similar with those of oxygen and nitrogen back-flushing, but the treatment efficiency of DOM was increased significantly because OH radical could be generated by reaction between saturated oxygen and photocatalyst.