The insecticide resistance level of Helicoverpa armigera (Hübner) to phoxim,cyhalothrin,and emamectin benzoate in the main cotton-growing areas of Yellow River Region were monitored in this study. Eight geographic populations of H. armigera were collected from Henan,Hebei,Shandong and Shanxi and tested by leaf dipping method to monitor the resistance level of H. armigera to three insecticides. The results showed that all populations of H. armigera from different monitoring area showed a middle level of resistance to phoxim,with the resistance index remained between 25.2-65.7 in 2016 and 24.2-48.8 in 2017,showing a rising trend in recent years. The resistance of H. armigera to cyhalothrin reached a middle to high level,and the resistance level and developing trend were discrepant among eight regions. The resistance level of Cangxian,Yanggu and Xiajin populations of H. armigera increased obviously,with resistance index increased from 21.3,51.9 and 128.9 in 2016 to 90.2,187.5 and 269.3 in 2017. The resistance of Qiuxian and Anyang populations of H. armigera shifted from a high level to middle level with the resistance index of 145.4 and 165.7 in 2016,and 72.2 and 59.1 in 2017. Eight populations of H. armigera showed a middle level of resistance to emamectin benzoate in 2016 and 2017,with the resistance index of 16.2-92.8 and 10.6-89.8,respectively. All the eight populations were found to have developed resistance to all three kinds of insecticides,excessive use of the same kind of insecticide therefore should be avoided or limited. In order to delay the development of insecticide resistance of H. armigera,different insecticides should be used in rotation. 