Abstract: This text introduced various meaning and the function of index signs of the PVC resin completely, not only include the GB/T5761—2006 in the index sign in 10 index signs list, such as: Viscosity Number (K value or Polymerization Degree ); Impurity Granule Number; Volatile Matter; Bulk Density; Course Particles; “Fish Eyes” Number; 100g resins Plasticizer Absorption; Whiteness; Determination of Conductivity of Water Extraction ; VCM Content. Still have the other the index sign outside the Chinese national PVC resin standard, include: Thermal Stability, Molecular Weight Distribute, A path, the Initial White Degree, Meltdown Liquidity, the Density of the Extrusion and Powder Body Liquidity etc. Pass by the analysis and the introduction, we can deepen our understanding the characteristics and the functions of the PVC resin index. It is easier to select the PVC resin by index. It will help to use the PVC resin better than before.

Key words: poly(vinyl chloride), performance index, selection, formulation, function