The products of the mechanochemical interaction in the system Ti-С held in the high energy planetary ball mill were studied by the methods of diffraction with synchrotron radiation (quantum energy 33.7 keV) and of the high-resolution scanning electron microscopy. The reasonable assumption was made about the mechanism of mechanochemically induced reactions in this system. The interaction proceeds with the formation of mech-anocomposites Ti/C at the first stage, followed by melting of titanium, spreading it over the carbon particle surface and practically simultaneous crystallization of titanium carbide. The use of the activator allows to accelerate the process of the TiC formation significantly.