Sodium humate has the following main function in ceramic clay (glaze) : 1. Potentiation The strength of the ceramic can be increased about 80%, reduce breakage rate of semi-finished products, in favor of finishing semi-finished products. 2. Plasticization Sodium humate can improve the plasticity index more than 40%, so that the mud is easy to be shaped, make semi-finished products not easy to be cracked, much more convenient for mechanized producing. 3. Dilution Sodium humate can increase the fluidity of glaze slurry 50%, is a good dispergator. 4. Sorption Sodium humate can improve the sorption capacity of ceramic body for glaze, reduce a series problem of flaking, pinhole, disconnection, lack of glaze and so on.