The hydrophilic group of the pesticide surfactant includes a carboxyl group, a sulfate group, a sulfonic acid group, a polyoxyethylene group and the like. The carboxyl group generally has poor wettability and good dispersibility, but is unstable in hard water and easily decomposes in an acidic medium; the sulfate group has good wettability but is easily decomposed and foamed in an acidic medium; the sulfonic acid group is hydrophobic to the organic substance. It exhibits strong wetting ability and is highly stable in hard water as a wetting agent; polyoxyethylene has good dispersing emulsification, low foaming and can soften hard water. The hydrophilic group of the surfactant has stronger wetting property in the middle of the molecule than at the end of the molecule. For example, sodium alkyl sulfate, hydrophilic group-SO4- is better in wettability in the middle, and the surface tension is also stronger. PVC Accessory,PVC Corner Line,PVC Sheet Goolee Decoration Material Co., Ltd. , http://www.jxpucolumn.com