I have just finished the final experiments of my PhD project assessing the thermal tolerances of aphids (Myzus persicae). I have investigated the effect of repeated high temperature on many physiological characters such as thermal tolerance, respiration, and osmolytes such as polyols and sugars. Also, with using chemically defined diets, I have been revealing the central role of sucrose concentration, amino acid concentration and composition, and sucrose: amino acid ratio in shaping aphid performance, and examining the effect of these vital compounds on physiological character at high temperature. Finally I have been investigating the costs and benefits of different time of recovery between high temperature conditions by measurement important compounds and their thermal tolerance. I had presentation for some findings of my PhD at the sixth International Symposium on the Environmental Physiology of Ectotherms and Plants (ISEPEP6) in Aarhus, Denmark, 3-7 August 2015.