In this paper, by mean of a quantum-mechanical treatment, we study the interaction of plasma with a coherent electromgnetic field inside a cavity. The eigenstates and eigenvalues of the Hamiltonian of this system is obtained. This eigenstates is the generalized squeezed coherent states. The formulas of the squeezing, anti-bunching, sub-Poisson statistics effects and measured phase operator of the generalized squeezed coherent states is obtained. All of these effects are lime conservative.