PVDF is a kind of semi-crystalline polymer, with the short C-F key of bond length and strong bond energy. PVDF has the characteristics of heat-resisting, corrosion resisting and radiation hardness which makes it ideal to be used as membrane separation materials. PVDF hollow fiber ultrafiltration membrane is widely used in seawater desalination plant pretreatment, reclaimed water recycling, membrane bioreactor (MBR), wastewater treatment and other field.In the polymer hollow fiber membrane spinning process, the introduction of reinforced braided hose or fine silk, in order to improve the strength of hollow fiber ultrafiltration membrane, ultrafiltration membrane to prevent broken wires occur during use.