CMC is applied in building coating industry: CMC is applied in hydrolactoprence urushi, because it has rheological nature. It can get a certain flowing performance, under the action of brush and tumbling box shear force. At the same time, it can control viscosity and floating. CMC occupy 1-3 percent in hydro coating. CMC is applied in ceramics industry: CMC can be applied as semi-finished viscosity in ceramics industry, for it can increase plasticity performance. CMC can be used as flowing control matter in ceramics glost substitute, which has the performance of retain glost substitute, to prevent it from getting to tear cicatrices before cooking finish.