Ultrafiltration is a solution for separation or concentration of film through a separate technology. Ultrafiltration membranes are like sieves, under certain pressure of (0.05~0.6MPa), allowing solvents and is smaller than the pore size of the solute, and block larger than the pore size of solute through to complete purification, separation and concentration of the solution. The membrane filtration technology has become one of the most widely used in the field of membrane separation, in the food and beverage, chemical, electronic, thermal, dyeing and printing, papermaking and urban water supply, such as a large range of applications.