Phase transformations in Sm$_{2}$Co$_{17-x}$Ti$_{x}$—Н$_{2}$ (x = 0.1, 0.2, 0.5, 0.95 and 1.7) system are investigated by means of the differential thermal (DTA) and X-ray phase analyses during conventional and solid hydrogenation, disproportionation, desorption, recombination (HDDR) treatment under hydrogen pressure of 3.0—5.2 МPа and temperature up to 950°C. The increase of titanium content leads to the increasing stability of initial ferromagnetic phase with Th$_{2}$Zn$_{17}$-type structure. At х = 0.1 and 0.2, the initial compound completely disproportionates into samarium hydride and cobalt. The partial disproportionation occurs at titanium content х = 0.5. They are found recombined Th$_{2}$Zn$_{17}$-type structure phase, cobalt and traces of samarium oxide after recombination at 850°C in alloys with х = 0.1, 0.2 and 0.5.