XD series vacuum pump is of single stage coupling structure, whose operation performance is high rotary speed, low noise, quick suction and high efficiency. The pump can be cooled by air. With oil-return resistant structure, the pump oil is kept from returning to the suctioned system. A gas-draining filter fixed in the pump, which operates stably with small vibration can effectively eliminate the oil mist, and can operate under any pressure. The technical parameter of the pump is 6×102. The pump is applied to several sectors such as food vacuum packing, pharmaceutical, paper convey in printing machines, glass industry convey, vacuum clamps and drying industry.