The purpose of this research was the comparative analysis of cardiorespirative system parameters depending on the ecological conditions in children of the different age to select the most sensitive and informative characteristics of the breath and hearth activity to estimate the organism functional condition, and the efficiency of correctional measures and to form the risk groups. Schoolchildren of 7-16 years old, living in the ecologically unsuccessful area of Tula (85) and the more safe ecologically area of Moscow (151) were observed by the technique of the rhythmocardiography and with the help of the device "Pneumoscrin-2" (Germany). The analysis of distinctions between children's populations of Tula and Moscow has shown the essential distinctions in the parameters of the cardiorespirative system, which accrued with the age of surveyed. It can be connected with the distinctions in ecological conditions. The received data can be used in practice of the medical control by physical training of various quota of the population and can help form the special groups of pupils for physical education.