The most alumina-rich compound in the CaO-Al 2 O 3 system is calcium hexaaluminate (CaAl 12 O 19 , CA 6 ). CA 6 ceramics were synthesized by the sol-gel auto combustion method. CA 6 phase formation has been achieved at 1200°C, which is a much lower temperature than the convention process (>1600°C). The influence of Sr 2+ substitution on the densification of Ca 1-x Sr x Al 12 O 19 (x = 0, 0.1, 0.2, and 0.3) ceramics was investigated. The X-ray diffraction analysis and structural refinement indicated the substitution of Sr 2+ ions into the lattice of CA 6 . The elongation of the "c" direction of the CA 6 crystal structure was found with Sr 2+ ion substitution. Surface morphology analysis showed a crystal growth with Sr 2+ substitution in CA 6 upto x = 0.2 composition. The 1600°C sintered specimen (with x = 0.2 composition) showed the bulk density and open porosity of 3.39 g/cm 3 and 4.92%, respectively. Thus, auto combustion synthesis and Sr 2+ substitution into CA 6 ceramics are feasible and beneficial for the densification of the ceramics.