<p>A study was carried out on the effects of temperature, reaction time, extent of oxidation, and contact time on the hydrocarbon group composition of the liquid products of the catalytic oxycracking of vacuum gas oil. The greatest effects on the qualitative group composition of the fraction with onset bp 195(200)°C are found for the reaction temperature and contact time, while the least effect is found for the reaction time. In addition to the reaction temperature and duration, the extent of oxidation of the oil sample was found to have a considerable effect on the yield and qualitative composition of the fraction with bp 195(200)-300°C, Higher reaction temperature, longer contact time, and longer reaction time were found to lead to greater formation of a more aromatic product. The alkane yield is maximal for 0.5% extent of oxidation and reaction time 600-900 sec. The yields of unsaturated and aromatic hydrocarbons were found to increase with more vigorous reaction conditions. Higher reaction temperature and shorter reaction time were found to favor a greater content of oxygen-containing compounds in the fraction with onset bp 195(200)°C, On the other hand, moderate reaction temperature and reaction time were found to favor a higher content of these compounds in the fraction with bp 195(200)-300°C. A comparative analysis with a sample obtained from traditional catalytic cracking showed much lower aromaticity in the fraction obtained with bp 195(200)°C but greater aromaticity in the fraction obtained with bp 195(200)-300°C. This behavior is attributed to the accumulation of high-molecular-weight highly-condensed hydrocarbons, which display greater activity in aromatization and alkylation reactions.</p>