Fouling resistance of ultrafiltration(UF)membranes is critical for their long-term usages in terms of stable per-formance,so convenient approaches to prepare fouling-resistant membranes are always anticipated.Herein,we demonstrate the facile fabrication of antifouling polysulfone-block-poly(ethylene glycol)(PSF-b-PEG,SFEG)composite membranes.SFEG layer was coated onto macroporous supports and cavitated by immerging them in acetone/n-propanol following the mechanism of selective swelling induced pore generation.Thus-produced SFEG membranes possessed high permeance and excellent mechanical strength.Meanwhile,the structures and separation performances of the SFEG layers can be continuously tuned through simply changing swelling du-rations.More importantly,the hydrophilic PEG chains were spontaneously enriched onto the pore walls through swelling treatment,endowing intrinsic antifouling property to the SFEG membranes.Bovine serum albumin(BSA)/humic acid(HA)fouling tests proved the prominent fouling resistance of SFEG membranes,and the foul-ing resistance is expected to be long-standing because of the firm connection between PEG chains and PSF matrix by covalent bonding.