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In order to obtain more data on hydrocracking catalysts, an experiment has been carried out to study the hydrocracking of vacuum distillate into middle distillate with the followin operating conditions: temperature: from 1 8 390' o 420 C, LHSV: from 0.45 to 0.90, pressure: 125 kg/cm and H2/HC ratio: 1000 1t/lt by using two Ni-Mo/ A1203-Si02 catalysts with various particle sizes using a Catatest unit operated in a contineous system.The gas product sample was analysed by using gas-liquid chromatography. The liquid product was fractionated and then these products were dewaxed by solvent dewaxing.Base on the experimental data it is shown that:* By increasing the operating temperature, LHSV, and decreasing the particle size of the Ni-Mo/Al 03-Si02 catalyst, the conversion rate, the quality of tze middle distillate, and the lubricant base stocks products increase, but the selectivity of these products will decrease .* At operating conditions T = 400°C, P = 125 kg/cm2 , LHSV = 0.45, and H2/HC ratio: 1000 lt/lt, the conversion rate, smoke point of kerosene, diesel index of gas oil, viscosity index of lubricant base stock decrease from: 54.08 to 50.08% by weight, from 22 to 16 rnrn, from 62.0 to 57.7 and from 133 to 118 for the low particle size and high particle size of the Ni-Mo/A1203-Si02 catalyst respectively.* The apparent activation energy of vacuum distillate is obtained as 28.717 and 23.720 kcal/mol for the low particle size and the high particle size of the Ni-Mo/ A1 203-Si02catalyst respectively.