New thermal conductivities measurements for the gaseous state of the binary mixtures of the hydrofluorocarbons HFC-32+ HFC-134a of different compositions are presented. The measurements were carried out at temperatures from 292.36 to 365.05 K in pressure range from 0.12 to 0.34 MPa. Thermal conductivity was measured with the vertical coaxial cylindrical stationary method. The estimated accuracy of the measured results is ±2.5 %. The thermal conductivity of binary gaseous mixtures at law pressure was estimated by Wassiljewa relation modified by Lindsey and Bromley with a mean deviation up to 1%. A new correlation which represent our experimental thermal conductivity data and those of the triple gaseous mixture HFC-32+HFC-134a+HFC-125 with satisfactory agreement is introduced.