Abstract: Experiments were conducted to study the susceptibility of 3 species of rangeland grasshopper to Nosema locustae in Xinjiang. Result showed the susceptibili ty of Dociostaurus kraussi was 86.3%, but that of Caliiptamus italicus and Gomphocerus sibiricus were 34.5% and 17.7% only. Adding 4 ml of 50% mala t ion to 100g Nosema locustae bran, the rate of population reduction of Cali iptamus italicus was 76.7%, which was much higher than that of using Nosema locustae alone. It seems that in a moderate grasshopper year, only applying Nosema locustae bran would suppress the population density under the control i ndex (10 head/m ²). But, in the years of grasshopper outbreak, Nosema locustae bran should be mixed with small dosage of insecticide tp improve the control effect.