The present work was conducted during two successive seasons 2009 and 2010. Survey some piercing sucking insects infesting soybean at Diarb – Nigm district, Sharkia Governorate Egypt .The aforementioned insect pests were collected by the two methods from soybean plants. The plant samples and sweep net were used. The obtained results showed that the visual examination proved to be the best method to collect all the aphid species, thrips and whitefly insects. The date showed that the sweep net proved to be the best method to collect all the leafhopper species. The seasonal population abundance of Aphis  gossypii (Glover) on soybean plants showed  one peak was recorded at the 3^rd week of August for the two seasons. The leafhopper species Empoasca decipiens (Paoli) and  Empoasca decedens (Paoli) were the most abundant species on soybean plants. Two peaks were recorded for    E. decipiens and E. decedens. The first peak occurred at 2^nd week of July for            E. decipiens, while the first peak of  E. decedens was noticed at 4^th week of July for the two seasons, respectively. The second peak was recorded in 2^nd week of August for E. decipiens, while E. decedens attained its second peak in 3^rd week of August for the two seasons of study respectively. One peak was found for Thrips tabaci (Lind.) during the 4^th week of June for the first season. While occurred in the first week of July during the second season. The whitefly species Bemisia tabaci (Genn.) was the most abundant species on soybean plants, two peaks density were recorded for this insect. The first one occurred in the first of July for the adult stage. The second peak was recorded in 2^nd week of August for the same stage. While the first one occurred at 4^th week of June for immature stage, and the second peak was recorded in the first week of August during the two seasons, respectively