Analysing the physiological indexes of peanut varieties (Arachis hypogaea. L) to find differences between them is one way to prequalify varieties of high yield, good quality and good resistance to adverse environmental conditions. The experiment was carried out on 10 varieties planted in the spring in Trieu Son District, Thanh Hoa Province, using a complete randomized block design with three replications. During the period of growth and development the authors conducted sample in and analysed physiological indexes, which revealed distinctions in the physiological indexes of the peanut varieties.