A computational simulation of the single-segment Nd:glass amplifier(SSA) has been made. By introducing the temporal factor, in our numerical codes the parameters of the discharge net can be optimized, and some important laser parameters, such as the storage efficiency and stored energy etc., can be calculated out from the given stored energy of electric capacitors. The codes have been checked up in the use of the experimental data at LLNL, showing the ability of predicted performance.