Experiments were conducted during the three seasons of 2010/11, 2011/12 and 2012/13 at the experimental Research Station in Moshtohor, Faculty of Agric., Benha Uni., Qalubia Governorate, Egypt. Three phosphorus fertilization levels (0,100 and 200 kg/fed) were applied to clarify their effects on the population density of Aphid spp and thrips (Thrips tabaci). In Faba bean fields, its relationship with chemical components on leave sand susceptibility of the two varieties (Giza 843 and Sakha 2). the obtained results showed that the highest population densities of these pests occurred at no phosphorus fertilization (control) followed by 100 kg/fed. The lowest population densities were recorded for the treatment at 200 kg/fed. On the other hand, Sakha 2 var received the lowest infestation. Significant differences between the means of chemical components in leaves of Faba bean plants were obtained.