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The discharge process in a discharge cell of shadow mask plasma display panel (SM-PDP) has been calculated by means of fluid model. The relation between content of xenon in Ne-Xe mixture gas, pressure and efficiency has been investigated for SM-PDP. Simulation results show that the resonance xenon responsible for 147nm UV decreases with the increasing of the content of xenon and pressure, while the molecular xenon, radiating 173nm UV, increases. The efficacy of SM-PDP could be enhanced further if the phosphor is selected carefully considering of this conclusion.