Abstract: Processes of pyrolysis and esterification post-treatment of tung oil have been studied to make diesel-like fuel with low oxygen levels. The catalytic pyrolysis reactions of tung oil was carried out in self-assembled distillation system, which showed the effects of pyrolysis on molecular components of pyrolytic product (pyrolytic oil). By GC-MS and SEC analysis, it was found that the fraction distribution of product was modified by pyrolysis. The acid value of pyrolytic products was 2.9 mg/g , the density was 825 kg/m3, the viscosity was 4.07 mm2/s, the gross calorific value was 41 kJ/g, the freezing point was -43 ℃, and the cold filter plugging point was -22 ℃. From the results of FTIR and GC-MS measurements, the esterification products were determined to consist of alkanes, with carbon chain below C24, fatty acid methyl ester of short chains below C16 and lower average molecular weight. The acid value of esterification products was 2.9 mg/g, the carboxylic acid content was significantly lower, and the burning heat value increased. The properties and applicability of products were also further improved.