Peristaltic pump also known as constant flow pump or hose pump, its mechanical operation principle is very simple. Because its operation mode is to pump fluid through the mechanical extrusion and release of the pump pipe alternately. The reason why it is called peristaltic pump is also because its pump pipe moves like a worm. Peristaltic pump is to install the hose between the mechanical rotor and stator, so as to achieve the purpose of pumping fluid. (see Fig. 1) when the peristaltic pump works, a section of pump pipe between the two rollers will form a pump chamber. The size of the pump chamber depends on the inner diameter of the pump pipe and the size of the rotor (see Fig. 2, Fig. 3, FIG. 4). The theoretical flow rate of peristaltic pump is the volume of pump chamber. Compared with the pump with the same rotary diameter, the pump with larger pump chamber will deliver larger volume of fluid per revolution of rotor, but the pulse generated is also larger. On the contrary, for the pump with smaller pump chamber, the fluid volume delivered by each revolution of its rotor is also small, but the pulse generated is also small. However, rapid and continuous pumping can reduce the pulse perfectly. Therefore, the selection of pump head is very important in some small flow and very small pulse requirements.