Three soybean varieties (Giza 21, Gza 35 and Giza 82) were selected to study thier sensitivity to SLWF infestation under field condition in 2001 and 2002 growing seasons. Data revelead that SLWF eggs increased gradually through soybean growing season. In 2001 season, there was no significant difference in the average number of SLWF eggs between Giza 21 and Giza 35, while the difference was significant between both varieties and Giza 82 until the 3'^d week of July. Also, data showid that Giza 21 harbored the highest number of SLWF nymphs followed by Goa 35 and Giza 82. Generally, Giza 21 variety was the most susceptible variety for the SLWF infestation followed by Giza 35 and Giza 82, respectively, during the course of study. In addation, both eggs and nymphs were higher in 2002 than in 2001 season. The eggs was positively corretied with nymphal stage in all soybean tested varieties. There were dear differences in the population of SLWF between soybean varieties. leaf biochemical structure affected on SLWF ovipostions and nymphal colonzations among soybean varities. It could be noticed that soybean varieties varied in thier components tested which resulted in a significant difference in most cases between cultivars.