Emulsioninwater (EW) is a lipophilic liquid original drug or a low-melting solid original drug that is dissolved in a small amount of water-insoluble organic solvent and formed by stably dispersing in water with very small oil droplets (<10μm) under the action of an emulsifier Opaque emulsion. The content of water emulsion is generally between 20% and 50%. When the water emulsion is used, it is diluted with water to form an emulsion for spraying. Water emulsion is actually a kind of concentrated emulsion, therefore, it is also called concentrated emulsion. It uses water as the dispersion medium, has low risk of combustion and explosion, is safe to store and transport, and has lower toxicity than emulsifiable concentrates, which reduces the impact of organic solvents. The hazards of the environment, humans, animals, and crops make it an ideal water-based alternative formulation for emulsifiable concentrates.