Surfactant is an important component of pesticide additives, and its molecule has two polar groups of hydrophilic group and lipophilic group. According to the electronic state, hydrophilic groups are divided into 4 types: anionic, cationic, nonionic and diionic. Surfactants can make the solution form an interface state through the balance of hydrophilicity and lipophilicity, and make its properties change significantly. Due to the characteristics of its chemical structure, surfactants have the two basic properties of adsorption and binding, thus presenting the functions of dispersion, emulsification, solubility, foaming, lubrication, wetting, and washing.