The non-isothermal crystallization kinetics of poly(ethylene terephthalate) from the blends of poly(ethylene terephthalate) and bisphenol. A polycarbonate were studied at various cooling (or heating) rates. The non-isothermal crystallizations were measured with differential scanning calorimetry, Ziabicki''s approximate theory, Avrami equation and Jeziorny''s and analysis of thermogram were employed to analyze the non-isothermal crystallization behavior. It was found that the addition of polycarbonate retarded the crystallization rate considerably and decreased the crystallinity. Rapid cooling (or heating) increased the crystallization rate due to athermal nucleation, but at the cooling (or heating) rate of 30℃/min the crystallinity of blends tended to decrease. Avrami exponent n for non-isothermally crystallized samples was found to be in the range of 2.2-2.3.