The theoretical research of the mathematical model definition is presented in the article, for the purpose of definition of the temperature regulation subsystem in the plants drying chamber. The following is presented the transporter velocity , that is known and constant quantity burning gas flowing through the chamber belivers the heat to heated substance and then it gets out through the chimney to the atmosphere; instruments for the temperature measurement are built in by means of regulation of the gas amount Q the heat or its temperature quantity theta regulation along the chamber is enabled. The gas inflow is presented as a step function, so that the rapid increase of gas inflow takes place at the moment t=t(0), Also, in the research is presumed that the temperature theta and the amount of the gas inflow Q are proportional in the constant part theta(n), Q(n) and in the part of growth theta(p), Q(p) where all quantities are considered as a function of time. The drying chamber, heated by the gas burning is considered in the following cases low intensify heating, high intensity heating, changing the fuel inflow amount changing the temperature in the chamber.