Abstract: The nuclear reactor pumped lasing model (NRPLM) is proposed in the present work. The power efficiency is built as a function of gas temperature (energy deposition), cell pressure, xenon concentration, He and Ar fractions. The software for calculation of energy deposition in laser cell is improved. The results show that gas components in cell decide the laser efficiency, neutron selfshielding effect affects the energy deposition in cell. Only when the cell thickness and gas pressure are a special function, the energy deposition in cell reaches its maximum. The present work will benefit the future experimental designs.