Abstract: Based on the Corresponding State Theory (CST) and other methods for predicting transport properties,a new corresponding state method is developed to estimate the viscosity from thermal conductivity and to estimate thermal conductivity from the viscosity of freon at the saturated liquid state. The HFC134a is taken as the reference fluid in the method. The average deviation of thermal conductivity estimated from viscosity is less than 7%,while that of viscosity estimated from thermal conductivity is less than 8%,which can meet the demands of engineering applications.