Thermal dissolution (TD) of a Chinese Shenfu sub-bituminous coal (SFSBC) at different conditions was carried out, and the effects of the addition of a thermal dissolution soluble fraction (TDSF) in coke-making coal blends on the properties of coke were evaluated in this study. The results suggested that SFSBC gave the highest thermal dissolution soluble yield (TDSY) of 61.9% in 1-methylnaphthalen (1-MN) at 360 degrees C. Then, the TDSY decreased to 44.8% when the TD temperature increased to 380 degrees C because of pyrolysis and condensation reactions of coal taking place at this temperature. Polar solvents gave larger dissolution ability to SFSBC than nonpolar solvents. The properties of TDSFs obtained from different conditions were quite different. At the TD temperature of 320-360 degrees C, the TDSF in 1-MN at a higher temperature contained more -OH groups with a narrow thermoplastic temperature interval compared to that at a lower temperature. The TDSFs in polar solvents crude methyl naphthalene oil (CMNO) and 1-MN added with 20% methanol at 320 degrees C contained less amount of -OH groups and more aromatic components, thus giving a wide thermoplastic temperature interval than the TDSF obtained in 1-MN. The 5 wt % TDSF addition in the coke-making coal blends decreased the softening temperature of the coal blends, thus improving the coke quality. Blending the TDSF obtained at a lower temperature or in polar solvents in coke-making coal blends had better effects on improving the quality of coke.