Under the condition of gravity and pressure difference, the liquid membrane of foam will flow unevenly and discharge liquid, and the gas in the bubble will continue to diffuse and permeate because of the different pressure difference on both sides of the bubble membrane, so the instability of the foam itself is mainly reflected in dynamics. [4] The attenuation mechanism mainly includes the diffusion of gas through the liquid membrane and the drainage of liquid membrane. These two properties are the inherent properties of the foam itself, which have nothing to do with the existence of surfactants. However, these two attenuation mechanisms only play an obvious role in the initial stage of the formation of the foam system. With the attenuation of the foam system, these two functions gradually weaken, making the foam system The rate of foam attenuation gradually slows down.