The seven-spotted ladybird, Coccinella septempunctata L. (Coleoptera : Coccinellidae), is an important predator of aphids: it plays an obvious role in reducing the population of the green peach aphid, Myzus persicae (Sulzer) (Homoptera : Aphididae) attacking peach trees. In the present study, C. septempunctata was released (one time), at early April 2006 and repeated in 2007, at Qalubiya Governorate at rates of 30, 60 and 90 eggs/tree. During the first season (2006), the reduction percentages in the population of M. persicae increased gradually with elapse of time reaching the max-imum. The achieved average reductions in aphid population were 77.50, 82.33 and 97.24% at the end of November for the three re-leasing levels, respectively in the first year (2006). However, the same trend was achieved in the second season (2007). The present work, has shown that the seven-spotted ladybird, Coccinella septempunctata L. could used successfully, as a biocon-trol agent among an integrated program for controlling the green peach aphid on the peach trees.