This product is a type of ion exchange resin which the polymcr matrix of styrene-divinylbenzene copolymer crosslinking structure has asulfonic group. Acidity of the product is equivalent to that of inorganic acid such as sulfuric acid and hydrochloric acid. This type of product presents ion exchange and ion extraction functions in alkaline,neutral, even aridic medium. The product also possesses characteristics of large exchange capacity,fast exchange speed and good mechanical strength.