It is used as sizing agent, thickener of printing and dyeing pulp, textile printing and rigid finishing in textile industry. Used as sizing agent, it can improve solubility and viscosity, and is easy to desize; As a stiffening finishing agent, its dosage is more than 95%; For sizing agent, the strength and bendability of sizing film are obviously improved; The results show that when the silica gel homogenate is prepared with CMC solution with a concentration of about 1% (w / V), the chromatographic performance of the thin-layer plate is better. At the same time, the thin-layer plate coated under the optimized conditions has appropriate layer strength, which is suitable for various sample adding techniques and convenient for operation. CMC has adhesion to most fibers, which can improve the combination between fibers, and its viscosity stability ensures the uniformity of sizing, so as to improve the weaving efficiency. It can also be used as finishing agent for textiles, especially anti wrinkle finishing, which brings changes to the durability of fabrics.