Because of its own advantages, micro vacuum pump is widely used in many industries. In the process of using, the volume of the equipment is very small. The micro vacuum pump will not appear oil in the process of using, so it is very environmentally friendly in the process of using. Now there are many specifications of micro vacuum pump. In the process of selection, the manufacturer first needs to make clear the purpose of the equipment. In the process of using the equipment, if it does not need to rely on its artificial water before pumping, so that the pump can pump the low water more effectively, otherwise it will be unable to pump and damage. The advantage of the micro vacuum pump in the process of using is that the equipment directly vacuumizes when it does not contact with water. After the vacuum is formed in the equipment, it needs to rely on the air pressure to pump up the water pressure, and then it starts to pump water. In the process of using, it may directly vacuumize because there is no water in the pump. After the vacuum is formed, it depends on the air pressure to pump up the water pressure, And then we start pumping. Micro vacuum pump in the process of pumping resistance, and then according to its judgment conditions to narrow the scope of selection, but in the process of using, we need to consider the problem of the exhaust end of the equipment in time, so as to better select the scope of its choice. In the actual application process of micro vacuum pump, the exhaust condition faced by the equipment is different. One is that the exhaust is relatively smooth and directly to the atmosphere. The other is that the exhaust resistance is relatively large, such as valves, large damping sensors and other parts on the exhaust pipeline. In the process of design and manufacture of modern micro vacuum pump, different exhaust conditions need to be treated differently. The exhaust port of the equipment allows a large resistance value. Such a parameter is to calibrate the exhaust capacity of the pump. In this way, strict technical means can be used to determine its type selection.