Abstract: Polyester membranes with different thickness were bombarded by ³²S ions from the HI-13 tandem accelerator of China Institute of Atomic Energy. The bombarded membranes with different densities of tracks were etched at different conditions, such as etching time, concentration of sodium hydroxide solution and temperature. The effects of etching condition on the pore shape and pore size were also investigated. The insulating capability of anti-metallic contamination of treated membranes was evaluated by using silver coatings. The results indicate that the insulating capability of nuclear pore-modified materials in anti-metallic contamination is greatly improved.