Study of pulsed discharge characteristic of methyl iodide mixture gas is important for pulsed chemical oxygen iodine laser. The pulsed discharge profile of current and voltage, break voltage and peak voltage, deposited energy were studied and the trends were obtained. Break voltage and peak voltage goes linearly with product of pressure, interelectrode gap, initial voltage, and deposited energy goes linearly with product of pressure, discharge volume and initial energy deposited in the capacitance.