Istant sodium silicate is also known as instant paohuajian, has all the properties of liquid paohuajian, and is used in building materials,refractories and acid resistane cement industry.The preparation processes of instant sodium silicate by centrifugal spray drying method were introduced. The advantages and the disadvantages of the production were discussed from equipment, technology, economic rationality.The chemical standards and application of instant sodium silicate were briefly reviewed.