Expanded polytetrafluoroethylene （ePTFE） membrane is a kind of new environmentally friendly material, which has development potential in various fields. It has a microstructure of ＂micro fibre - node＂, and the minimum micropore can be up to 0.1 μm, ana the porosity is as high as 82 %. EPTFE membrane is waterproof, dustproof and breathable, used widely in the fields of clothing, construction, dust filter bag, spacecraft, the air electrode, electronic lighting and packaging, etc. Along with more studies of the ePTFE membrane with excellent waterproof and dustproof and breathable properties, ePTFE membrane will be more and more extensive application and development in various fields.