The theory of stationary laminar flames must provide not only for calculation of flame-propagation velocities, but also for studies of flame properties under different conditions, and make possible the description of these properties by means of very simple analytical functions which would be of help in solving scientific or practical problems that require knowledge of laminarflame properties. A no less important object of the theory is to ensure the possibility of studying kinetic laws which govern chemical reactions at high temperatures when direct measurement of reaction rates is practically impossible. The process of flame propagation in systems involving straight TM and branched 5' 6 chain reactions was investigated earlier. The dependence of certain laminar-flame properties on the type of chain reaction effecting the chemical process in the flame can be determined from the results obtained. Thus the type of reaction which proceeds in the given combustible mixture can be established from flame properties which are determined experimentally. Once the reaction type is known, experimental values of elementary reaction-rate constants at high temperatures can be obtained from the dependence of the burning velocity on temperature, pressure and transfer coefficients. A comparison of basic properties and functions of burning velocity in chain-branching and nonbranching systems will be made in this work. P1 + Z--~ C + P2, (1) QI nl = hi F1 nl = hi K l (T ' )nz nl