A discharge-pumped XeCl excimer laser (PEL) with X-ray preionization was introduced. The capacitance lines were charged pulsed mode, and the energy stored in PFL was transfered to mixture medium by a multi-channel rail switch. As the source of X-ray, the vacuum diode produced X-ray during the time of about 500 ns earlier before the discharge of electrodes. The maximum output energy of 2 J was obtained experimentally with the charging voltage of 50 kV, the gas mixture of HCl:Xe:Ne＝1:2.5:2000, and the pressure of 3.546×105 Pa.