The analysis of allozymes has many specific advantages in analyzing genetic variabilities and diversities, so it has been widely used in the population differentiation, diversity and differentiation of species. Some previous studies have been documented that allozyme analysis, gene flow and evolution inter-population are closely related. Diamondback moth (DBM, Plutella xylostella L.) is a cosmopolitan insect pest, which mainly feeds on cruciferous vegetables. Widespread use of insecticides has led to the se...