Abstract: Pearlite and NaOH are mixed at high temperture to get alkali dissolution. The result shows that the quantity ratio of pearlite and NaOH is 1.00∶0.75. Burnt at 550 ℃ for 1 h ,the digestion rate of the valid chemistry composition SiO 2 of parlite can reach 83% or above .The digested liquor can be used as the industry sodium silicate, and come up to the national standard by analyzing the quantity.