Abstract: The mixture of nutrient biocide“Thuringcidfe”and four chemical pesticide respectively was used to control Plutella Xylostella L.The result showed that the indoor 72 hour′s proof con-trol of the four mixture ranged from 83.7%to 100%,and their field proof control ranged from 83.2%to 100%after seven days.They were all better than the normal chemical oesticide and Bt sold in the market,also the latter two mixture had the stronger instant control function;the co-toxicity coefficient were between 17.3%and 44.8%,the controlling effect was increasing as the co-toxicity increased.The plutella xylostella L,showed great escape,the eat refusal rate was be-tween 81.3%and 96.5%.Meanwhile the mixture had different nutrient funtion which could in-crease the height and weight of a plant.