Abstract: The concept of pesticide microemulsion along with its compositions,property and appearance were discussed.A series of factors in microemulsion were explored in detail,such as pesticide efficacy,surfactants dosage,addition of polarity solvents,microemulsion quality and so on.The advantage and disadvantage of microemulsion and emulsion (O/W) were compareal from the aspects of their biological efficacy,appearance,formulation and stability.In conclusion,microemulsion was expected to have a better market development potential.