Studies on some ecological aspects of Kilifia acuminata (Signoret) (Hemiptera: Coccidae) and its parasitoids on mango trees were carried out in Inshas El- Raml district, Sharkia Governorate, Egypt during two successive years (2007-2008 and 2008-2009). The obtained results revealed that total alive stages had two to three peaks of activity yearly in both top and bottom levels of the trees. Metaphycus sp. and Coccophagus sp.were recorded as parasitoids of K. acuminata. The pest activity appeared three generations annually either in the top and bottom levels of mango trees. Each generation was lasted about 4 months. They periods were from March to June, July to October and November to February, respectively. The total effects of a biotic factors (Temp.ºC, RH% and Light intensity Lux) under this study on the total numbers of alive stages during the two years were 84.17 and 38.30 % in the top level and 85.87 and 43.76 % in the bottom one, successively. Preferable level and preferable leaf surface of K. acuminata and its associated parasitoids were studied.