In dye printing paste, water treatment, agriculture, electric welding, paper making, ceramics, etc, used as thickener, binding, forming agent. It is a long history that Sodium Alginate is used for printing paste, yarn paste and cleaning paste. It is one kind of excellent paste for printing, which is applicable for printing of cotton, feather, silk and compound fiber especially after active coloring matter become. It has several decades of history and there is no other things can be compared with it at present. The largest characteristic is that it can't react with active coloring matter and can't produce covalent bond. It doesn't contain hydroxymethyl and only contain CHOH; Meanwhile, there is carhboxyl with strong negative electricity on its base ring. Therefore, it not only absorbs coloring matter, but also has exclusion that can make coloring matter move towards fiber from paste.