In　this　study,　a　Virial-type　viscosity　Equation　of　State　(EOS)　used　for　predicting　the　viscosity　of　the　viscous　fluid　of　common　refrigerant　was　established　via　relating　the　dimensionless　residual　viscosity　with　the　reduced　density.　Adopting　this　equation,　only　the　critical　parameters,　molecular　weight　and　eccentric　factor　of　the　refrigerant　are　needed　to　conduct　the　calculation.　Therefore,　on　the　thermodynamic　surface,　there　is　an　integrated　concordance　between　the　calculation　of　transport　property　and　that　of　equilibrium　property.　According　to　this　new　equation,　the　viscosities　of　nine　common　refrigerants　in　liquid　phase　were　calculated.　Compared　with　the　experimental　data,　the　total　average　deviation　is　2.36%　and　the　maximum　deviation　is　27.6%.