Abstract: The reaction mechanism of Fe-Ti-C system was studied by Deferent Thermal Analysis (DTA),X-Ray Analysis (XRD), Scanning Electron Micrograph (SEM) and other means during the reactive apglomerated spray powder flying when TiC-Fe cermet coatings were obtained by Reactive Flame Spray Synthesis (RFSS). It is revealed tha the reaction of Fe-Ti-C system happened step by step during the reactive spray powder flying, and basically finished when it reached the substrate, TiC-Fe materials were mainly synthsized when the spray distance is 125~170 mm. Therefore, Compared with the theditional oxygen-acetylene flame spray technology,the advantages of RFSS lied in simultaneous synteesis and deposition of expensive coating materials from an in-situ reaction of cheap raw materials.