Natural cellulose is the most widely distributed in nature, the most abundant polysaccharide, the source is very rich. Current cellulose modification technology are mainly concentrated in two aspects of etherification and esterification. Carboxymethylated reaction is a kind of etherification technology. After carboxymethylated cellulose carboxymethyl cellulose (CMC), its aqueous solution has a thickening, film forming, uf, water retention, emulsion, and suspension, colloid protection function, widely used in petroleum, food, medicine, textile and paper industries, is one of the most important cellulose ethers.