At present, most domestic and foreign pharmaceutical companies use ion exchange and reverse osmosis, ion exchange and other methods to produce purified water, and then by distillation method for the preparation of water for injection. The above-mentioned pharmaceutical water production process, ion exchange technology as a means of deep desalination is still widely used. However, ion exchange resin regeneration will produce a lot of waste acid, waste alkali, serious pollution of the environment, development is subject to constraints. Reverse osmosis membrane on the water bacteria, pyrogen, viruses and organic matter removal rate of 100%. Although the secondary reverse osmosis can be exempted from the use of ion exchange resin, but the salt content of raw water is extremely high, because the current system of desulfurization system desalination rate of about 98%, if the raw water containing high salt, the water conductivity Will exceed the control index.