Sodium Ligninsulfonate is mainly used for cement water reducing agent, cement agglomerate diffusion, water analysis out, increase their liquidity. Reducing the mixing water and saving cement. Used in oil drilling mud formula, it can effectively reduce the mud viscosity and shear force, to control the liquidity of the drilling mud, the inorganic clay and inorganic impurities will remain suspended in the drilling, prevent slurry flocculating, and have prominent salt resistance, calcium resistance and high temperature resistance.