Six different ratios of blends from nylon-12 and acrylonitrile-butadi-ene-styrene (ABS) were prepared by the melt mixing technique. Thermal analysis of these blends were carried out by differential scanning calorimetry and thermogravimetric analysis. It has been observed that the blend ratios such as 70/30 and 60/40 of nylon-12/ABS were more compatible in comparison with other blend ratios. It is evident from the values of glass transition temperature and activation energy. Thermogravimetric analysis shows a decreasing trend of pyrolysis temperature of these blends with the increase in ABS concentration. The melt-flow index and density data are found to indicate better physical and flow characteristics in the blend compared to pure nylon-12.