Abstract: Using a mixture of hydrotreated LCO and HVGO as feed, the FCC reprocessing (MIP-LTG technology) was conducted in a small-scale unit. The results showed that compared with the comprehensive calculation results of the individual results of hydrotreated wax oil and diesel oil, the yields of low-value products such as dry gas，slurry and coke reduced，and the total liquid yield increased by 0.97 percentage points. The commercial application data in Company A showed that when the ratio of the hydrotreated LCO in the mixed materials increased by 7 percentage points，the total liquid yield increased by 1.55 percentage points，the dry gas yield decreased by 0.31 percentage points，and the RON of gasoline improved by 0.6 units. The results in Company B indicated that in the case of poorer feed and the ratio of hydrotreated LCO as high as 11 percentage points，the total liquid yield increased by 0.2 percentage points，the dry gas yield decreased by 0.69 percentage points，and the RON of gasoline increased by 1.1 units. The industrial results showed that the MIP-LTG technology is a simple route and has a good performance for hydrotreated LCO conversion.

Key words: catalytic cracking diesel, hydrogenation, reprocessing