Methylcellulose is widely used in construction industry, such as cement, mortar, joint desliming and so on. It is used as film-forming agent and adhesive in cosmetics, medicine and food industry. It is also used as sizing agent for textile printing and dyeing, synthetic resin dispersant, coating film-forming agent and thickener. Alkali cellulose is prepared from pulp, which reacts with methyl chloride or dimethyl sulfate in an autoclave, and then refined with warm water. Methylcellulose is generally considered safe, non-toxic, non allergenic and non irritating. In the pharmaceutical industry, methylcellulose with low or medium viscosity can be used as the adhesive of tablets and also for tablet coating. High viscosity methylcellulose can be used to modify disintegration or as skeleton material of sustained-release preparation. Methylcellulose with high degree of substitution and low viscosity can be used for aqueous coating, suspension aid, thickener, emulsion stabilizer and protective colloid. High degree of substitution and high viscosity methyl cellulose can be used in eye drops, and can also be used as matrix material for cream or gel.