The molecular sieve is one kind of upgrade desiccant which is made up of aluminosilicate. Because there are inimitable pore size and much higher specific surface areas, there are many excellent merits. (1) The selective absorption as the different size and shape of molecules, that is to say, it only absorbs those molecules of which the diameter is less than the pore size of molecular sieve. (2) To those smaller polar molecules and the unsaturated molecules, it has the property of selective absorption. The bigger the polarity is, and the higher the instauration is, the stronger property of the selective absorption is. (3) It has much stronger property of water sorption too. No matter in the situations of higher temperature, larger space velocity, or lower content of water it is, there is rather higher capacity of water sorption. Now, there are many types of the molecular sieve, such as 3A, 4A, 5A, 10X, 13X, and Cu2+ etc., which can be produced by our company and applied to the industries. According to the industrial application specialties ,we endue our products with the characters of higher adsorption speed ,stronger crushing and anti-contaminative resistance ,more cyclic times and longer work-span .All these advantages have made it come to be the most essential and necessary desiccant in the fields of the deep drying ,refinery polymerization, air separation, and any other non-acidic gasses of liquids in petroleum and chemical industrials.