Abstract: The paper aims to clarify the application effect of pesticide decrement synergist‘Jijian’on wheat stripe rust. The authors carried out field efficacy tests of triadimefon WP and propiconazole EC with addition of ‘Jijian’on controlling wheat stripe rust, by using the methods of forecasting, randomized block design and statistical analysis. The results showed that: during the epidemic period of stripe rust, the control effects on the 7th day and the 19th day reached more than 93% and 100%, respectively, by the application of 15% triadimefon WP 1200 g/hm2 and 25% propiconazole EC 600 mL/hm2 respectively for 2 times; when 15% triadimefon WP 840 g/hm2 +‘Jijian’225 g/hm2 or 25% propiconazole EC 420 mL/hm2 +‘Jijian’225 g/hm2 were applied ‘( Jijian’could reduce the dosage by 30% of the two pesticides), the control effect on the 7th day was 89.4% and The paper aims to clarify the application effect of pesticide decrement synergist‘Jijian’on wheat stripe rust. The authors carried out field efficacy tests of triadimefon WP and propiconazole EC with addition of ‘Jijian’on controlling wheat stripe rust, by using the methods of forecasting, randomized block design and statistical analysis. The results showed that: during the epidemic period of stripe rust, the control effects on the 7th day and the 19th day reached more than 93% and 100%, respectively, by the application of 15% triadimefon WP 1200 g/hm2 and 25% propiconazole EC 600 mL/hm2 respectively for 2 times; when 15% triadimefon WP 840 g/hm2 +‘Jijian’225 g/hm2 or 25% propiconazole EC 420 mL/hm2 +‘Jijian’225 g/hm2 were applied ‘( Jijian’could reduce the dosage by 30% of the two pesticides), the control effect on the 7th day was 89.4% and 91.7%, respectively, while the control effect on the 19th day was 99.8%-100%; when 15% triadimefon WP 720- 600 g/hm2+‘Jijian’225 g/hm2 or 25% propiconazole EC 360-300 mL/hm2+‘Jijian’225 g/hm2 were applied ‘( Jijian’could reduce the dosage by 40%-50% of the two pesticides), the control effect on the 7th day reached more than 78.0% , while the control effect on the 19th day was 97.7%- 99.8% . There was no significant difference on the 7th day between the two pesticides used alone and adding‘Jijian’to reduce the dosage by 30% dosage, but both had significantly higher effect than that adding‘Jijian’to reduce the dosage by 40%- 50%. There was no significant difference of the control effect on 19th day among different treatments. These indicate that if the disease is lighter, the dosage of the pesticides can be reduced to 50%, that is to say, 15% triadimefon WP 600 g /hm2+‘Jijian’225 g/hm2 and 25% propiconazole EC 300 mL/hm2 + ‘Jijian’225 g/hm2, in order to reduce pesticide usage and pesticide residue pollution, and cut the control cost.