The results of field trails showed that the betacyfluthrin·Emamectin benzoate 3.2% ME was a suitable insecticide product for controlling cruciferous vegetable pests including Spodoptera exigua (Hübner),Plutella xylostella (L.),Pieris rapae(L.) and Spodoptera litura (Fabricius) with quicker and long effect. The control effect were 60.67%～77.41% in first day, 81.82%～97.77% in the third day and 83.74%～99.25% in the seventh day with the dosage of 20，25 and 30 g/667m²(9.6，12.0 and 14.4 g ai/hm²). It can be used to control the four kinds of pests from cruciferous vegetable in the field with the dosage of 25～30 g/667m²(12～14.4 g ai/hm²).