Abstract: The repellent ability of 7 nonhost plants such as Alliaceae sativum L.， Mentha haplocalyx Briq. and Tulbaghia violacea Harv. to 3 main cabbage insect pests such as aphid， Plutella xylostella and Pieris rapae， as well as the influence of interplanted with nonhost plants on the population dynamics of the 3 pests were conducted in greenhouse. The results indicated that the amount of aphid were decreased by 5835% and 5617%， and the amount of Plutella xylostella were decreased by 5204% and 4052%， respectively， when A. sativum L. and M. haplocalyx Briq. were planted at the entrance of the cabbage greenhouse. Meanwhile， the amount of Pieris rapae were decreases by 5536% and 4152% in cabbage interplanted with A. sativum L. and T. violacea Harv， respectively. It also indicated that the effective repellent distances of A. sativum L. on Pieris rapae， aphid and Plutella xylostella were 30， 10 and 05 m， respectively， which of M. haplocalyx Briq. on aphid and Pieris rapae were 30 m and 10 m， but showed no significant effect on Plutella xylostella. The effective repellent distances of other plants on the 3 main cabbage pests were less than 05 m. The repellent ability in general showed as A. sativum L.＞M. haplocalyx Briq.＞L. angustifolia Mill.， R. officinalis L.， Plectranthus hadiensis var. tomentosus（Benth.ex E.Mey.） Codd， S. japonica Thunb.， T. violacea.

Key words: repellent effect, aphid, Plutella xylostella, Pieris rapae, nonhost plants