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Required condition for the isooctanoic acid solution of molybdenum isooctanoate (catalyst intermediate) to dissolve heavy oil: A must have sufficient mixing time and intensity before entering the slurry bed reactor； B must be mixed and dispersed at a temperature lower than the decomposition mixing temperature of the catalyst precursor ； The C mixed feed is heated to a temperature higher than the precursor decomposition temperature but lower than the hydrocracking reaction temperature of the reactor feed. Interpretation based on ABC① High height-to-diameter ratio of the mixed feed tank ； ②The intention of increasing the temperature at the lowest feeding position for fresh feed at 320∽340℃, combined with 310℃ as the minimum reflux temperature and oil sludge circulation at 300℃ ； ③Careful premixing of hydrogen at 400°C in front of the furnace before it enters the reactor ； ④Ensuring the mixing intensity at the series decomposition temperature (370°C) for mechanical action + recirculation + piping + pump + hydrogen mixing, with 3 out of 4 sets of impellers in the mixer used for radial recirculation of fresh agent and the fourth set used for fresh feed ； ⑤Pulp formation, nanodispersion, recycled MoS2, and the ability of recycled oil residues to carry H2S are all important aspects in pulp formation, as well as key factors determining the efficiency of the initial reactions. Note: The decomposition and condensation temperature of asphaltenes is 330℃ ； Precursor decomposition temperature: 370°C (which is also the condition for stopping injection during annealing) ； The radical rate is significant at 400°C, prominent at 410°C, and before 430°C the activation hydrogenation reaction rate exceeds that of cracking, resulting in a noticeable inhibition of coking.