KY- OD228 is an emulsifier with excellent emulsification effect for the system of methyl ester oil. This product has strong versatility and adaptable for preparations with different concentrations of nicosulfuron, mesotrione, nicosulfuron + atrazine, nicosulfuron + mesotrione + atrazine OD etc. It also has excellent stability, and the emulsifier can exceed the national standard 200 times for the water bath experiment which left to rest for 1 hour in both soft and hard water. The experiment result shows no oil slick, no stratify, no sediment.