Dissolve simethicone in a suitable solvent to make a silicone solution type defoamer. Use organic silicon defoamers made from organic solvents such as polychlorinated ethane, toluene and xylene. It can be used for the defoaming operation of oil-soluble media; and it is a silicone defoaming agent prepared with water-soluble organic solvents such as hexanediol and glycerin. It can be used for defoaming water solution. The preparation process of solution-type silicone defoamer is very simple. Easy to use, silicone oil is dispersed in the foaming liquid with the help of organic solvents to play a defoaming effect, and some solvents will also play a defoaming effect during the diffusion process. However, this method has not been widely used, mainly because a large amount of use will increase the cost of defoamers and may cause environmental pollution.