The seguegation in the discs of Ti-17 alloy was studied by optical microscopy and scanning electron microscopy. The nonuniform microstructure in the discs has suggested the nonuniformity of the alloy composition. The unusual light point or block found in the disc are segregation, which are rich titanium, rich molybdenum or higher chromium and zirconium. These defects result from VAR process, which relates to the size of titanium sponge and alloying elements before melting.