[en] The tracer method has been applied in the investigation of condensate - gas reservoirs, helping to provide important information such as the connection between injection wells and production wells as well as phase saturations. In particular, Perfluorocarbons gas tracers (PFCs) are commonly used because of their outstanding advantages such as stability and environmental friendliness. The partition of PFCs in the gas-condensate phases is characterized by the partition coefficient Kd - the ratio of the PFCs concentrations in condensate and gas phases at equilibrium conditions. This study presents a method for calculating the Kd coefficient of PFCs in hydrocarbon-gas phases based on the parameters such as the equilibrium coefficient of the tracer, the density of the phases and the average molecular mass of the phases. The method was then verified with the measurement data of the partition coefficients of the PFCs at a temperature of 70oC and a pressure range of 1000 - 2000 psi on the fluid collected from the STT condensate - gas reservoir with an error of 10% compared with experimental data. (author)