Objective To investigae the function of the glass colorant on the color of the machinable infiltrated ceramics（MIC）. Methods Five kinds of glass with different colorant were infiltrated through the aluminous matrix by heating the components to 1 100 ℃ for 2 hours. The specimens' surface was polished, and their thickness was 0.5 mm. Results The refractive index of the MIC infiltration glass was 1.59691(587.6 nm, nd). The most different parameter of the MIC color were L*, then a*，and b* had little difference . The parameters of the color space of MIC were: L*（64.55—71.46）, a*（3.35—7.38），b*（10.00—12.41）, Ca*b*（11.38—13.95）, ha*b*（54.07—73.00）. These were almost close to the color parameters of Vita In-ceram. Conclusion This experiment proved that the glass colorant was changed the MIC color parameters, and the main function was on L*, then a*. The ceramic color was up to the requirement of clinic.
