The formation kinetics of Sr2FeMoO6 (SFMO) was diagnosed during the solid-state reaction of SrFeO3-x and SrMoO4 at different temperatures and heating rates. The reaction kinetics was analyzed by X-ray diffractometer, and the extent of the reaction was quantified by the internal standard method. The non-isothermal kinetic empirical model was proposed to evaluate the activation energy and rate constant of SFMO and further justified to be valid to picture the reaction kinetics of SFMO. (C) 2005 Springer Science + Business Media, Inc.