In this paper kinetic equations for plasma oscillations are derived. The method is the following: the complete Lagrangian function for a system of charged particles in an electromagnetic field is written down; the amplitude of the oscillations is defined explicitly and an expansion in powers of it is performed. As a result, a power series for the Lagrangian is obtained. The zeroth order Lagrangian gives only the equilibrium state: the first order Lagrangian vanishes identically; the second order Lagrangian contains the natural oscillations of the plasma; the higher order Lagrangians give the interactions of the natural oscillations. The distribution for oscillators in phase space is introduced and the oscillation interaction Lagrangian is written in the second quantization representation. The kinetic equation for the oscillation distribution function is then obtained by the usual method.