Mild hydrocracking of 30% crude oil (Indian Crude Oil, North Gujarat base) solution in light gas oil is carried out over a commercial hydrotreating catalyst at a temperature range of 300-450-degrees-c and pressure of 6.8-20.0Mpa in laboratory reactor.About 30 to 60* of the long residue (365-degrees-c+ cut) in the solution is converted to light distillates. A mathematical model has been developed to predict the yields of products.