Centrifugation technology is an indispensable physical technical means in studying the structure and function of organisms. Because there are differences in sedimentation coefficient, buoyancy and mass among various substances, powerful centrifugal force field can be used to separate, purify and concentrate them. There are all kinds of centrifuges at present. It can be used for centrifugation of samples from less than 0.05 ml to several liters. Centrifugation technology is widely used, including collecting and separating cells, organelles and biological macromolecules.