Studies on the composition of insect pest communities on tea crops have implemented in early 20th century (Du Pasquier, 1932). The composition of natural enemies on insect pests of tea crops have been studied since late 20th century (Nguyen Van Thiep, 1998; Le Thi Nhung, 2002; Pham Van Lam et al., 2003, 2005, 2007a, 2007b, 2008, 2011, Pham Van Lam, 2013); however, these studies have not yet carried out the relationship between predators and their insect pests, and the effect of environmental factors on this relationship. The application of pesticides, inorganic fertilizers and plant growth regulators in tea pest management has been steadily increased and play an essential method of tea growers. Not only does overuse of insecticides kill tea pests, but also promote the appearance of other dangerous insect pests, some minor pests could be a dramatic increase in population and become major pests declining the abundance of natural enemies. VietGAP (Vietnam Good Agriculture Practice) standard on tea trees was started firstly in 2008 and regulated that the application of Integrated Pest Management (IPM) and Integrated Crop Management (ICM) are prioritized, especially recommendedbiological. Based on scientific literature review and current tea growing issues, this study was implemented with the title “A study of species composition and relationship of predatory insects with insect pests on tea in Phu Tho, and effects of some ecological factors on their occurrence”.