Gas discharge properties at flat electron emission lamp is much different from general gas discharge properties in tube at low pressure(< 1 Torr). When gas discharges in tube at 1 Torr, Townsend discharge, glow discharge and abnormal discharge region can be clearly distinguished. But gas discharges at Flat Electron Emission Lamp, Townsend discharge and glow discharge can not clearly distinguished on the chart of I-V(current and voltage) curve. When gas is in glow discharge status after breakdown, self-sustaining discharge voltage is as same as breakdown voltage. Gas pressure at Flat Electron Emission Lamp drops to 10-1 Torr. In comparison between I-V curve at pressure 1Torr and at pressure 10-1 Torr , there are increase in breakdown voltage and much difference in abnormal glow discharge region also. Electric charge distribution all over the space and effects can be estimated by using Townsend’s basic ionization equations and Poisson’s equation. Further, it is concluded that impact on electric field due to voltage drop on cathode is directly related to secondary electron emission. Combining and appropriately modifying those equations, I-V curve in the section of abnormal glow discharge at Flat Electron Emission Lamp can be simulated.