Two field experiments were conducted In Sakha Research Station, Kafr EI-Sheikh, Agricultural Research Center during 2002/2003 and 2003/2004 seasons to investigate the effect of boron and molybdenum fertilizer levels on juice quality and chemical constituents of some aver beet varieties. This study included 27 treatments which were the combination between three sugar. beet varieties (Montebianco, Kawemira and Gloria), three boron fertilizer levels (zero, 0.50 and 1.00 kg 8/fed) and three levels of molybdenum fertilizer (zero, 0.25 and 0.50 kg Mo/fed). Treatments were arranged in a split plot design with three replications. Varieties were allocated in the main plots and the combination between levels of boron and molybdenum were assigned at random within sub-plots. Montebianco variety recorded the highest values of total soluble solids percentage and potassium concentration in roots, petioles and blades, while, Gloria variety produced the highest values of sucrose, purity percentages and boron concentration roots, petioles and blades. Nitrogen percentages did not reach the level of significance, except in the first season for roots and petioles. Increasing the supplied dose of boron negatively affected the values of total soluble solids percentage and it caused significant increases in sucrose and purity percentages. Application of 1.00 kg 8/fed attained a significant increase in the molybdenum concentration in roots as well as Gloria and Kawemira gave the highest values of boron and nitrogen concentrations in blades, while application of 0.50 kg 8/fed gave the highest insignificant concentration of molybdenum in the petiole and blade. Increasing the supplied dose of molybdenum caused significant increases in sucrose and purity percentages and negatively affected the values of total soluble solids percentage, nitrogen concentration in roots, petioles and blades. Application of 0.50 kg Mo/fed attained a significant increases in the molybdenum concentration in roots, petioles and blades. Application of 0.50 kg Mo/fed or (0.50 kg 8/fed + 0.50 kg Mo/fed) gave the lowest value of total soluble solids percentage.