Abstract: Glass-forming ability of calcium aluminate glasses is improved with the actlition of BaO, glass-forming region of CaO-BaO-Al2O3 ternary system is identified which is the area with content of Al2O3 between 25 mol% and 45 mol%, CaO between 45 mol% and 65 mol% and BaO between 0 mol% and 18 mol%. According to the study of ifrcdo, value. Influences of the ratio of content of Al2O3 and CaO(A/C) and the content of BaO on glass-forming ability were discussed based on the value of Hruby. It was found that glass-forming ability of 56 CaO-8 BaO-36 Al2O3 is best when the value of A/C is 0.60 and the content of BaO is 8 mol%. Batches without any water sintered in normal air inthe cicwstance, protected by dry nitrogen as well as stirred with CCl4 respectivelf into, 30 as to detect as IR-transmittance spectrum and investigated by residual contents of water namely B(OH). which indicated that the transmittance at 2.9 m is nearly 84% and the residual B(OH) is 0.003 7. It was demonstrated that hydroxyl was almost removed by stirring with CCl4 while protected by dry nitrogen.