Hydroxyethyl cellulose(HEC) is a gelling and thickening agent derived from cellulose. HEC is non-ionic, water-soluble materials that provide good properties of thickening, suspending, binding, emulsify, film-forming, stabilize, disperse, retain water and etc. And It is widely used in coatings, construction, medicine, food, papermaking and polymer polymerization industry. In medicine field, Hydroxyethyl cellulose and methyl cellulose(MHEC) are frequently used with hydrophobic drugs in capsule formulations, to improve the drugs' dissolution in the gastrointestinal fluids.