Sodium benzoate powder are mostly white, odorless or micro benzoin smell, taste sweet, there is convergence; soluble in water (room temperature) about *3.0g/**0ml, PH is about 8; sodium benzoate is acidic preservatives, no sterilization, in alkaline medium bacteriostasis; its antiseptic best PH 2.**4.0 solution effect of sterilization in 5% PH5.0 is not very good. Sodium benzoate lipophilicity is large, easy to penetrate the cell membrane into the cell body, disturbance of cell membrane permeability, inhibit the absorption of amino acids into the cell membrane; alkali storage cell ionization intracellular acidification, and inhibition of respiratory enzymes in cell activity, prevent acetyl coenzyme A condensation reaction, so as to food preservation objective.