By the Steady Drop Method the specific heat behaviors of three kinds of Na_2O-CaO-SiO_2 glass products, flat glass, container glass and ware glass, are measured with the copper block calorimeter. 本文根据稳态下落卡计法,采用铜卡计比热仪研究了国内生产的三大类Na2OCaOSiO2系统玻璃产品平板玻璃,瓶罐玻璃和器皿玻璃的比热行为。