[Objectives]  To explore the stigma structure and response of the respiratory metabolism of Gomphocerus sibiricus to high temperature stress. [Methods]  Stigma structure was observed via scanning electron microscope (SEM), and O₂ uptake rates, CO₂ release rates, metabolic rates, and respiratory quotients, measured with a multi-channel insect respiration apparatus (Sable Systems, USA). Respiratory measurements were made a 3℃ intervals within a temperature gradient of 18-~42℃. [Results]  G. sibiricus has ten pairs of circular, or near circular, shaped stigmata. Filter apparatus inside stigma were clustered. The respiratory metabolism of G. sibiricus first increased, then decreased, between temperatures from 18 to 42℃. O₂ uptake rates, CO₂ release rates and metabolic rates of male and female adults at 18℃ were significantly lower than those at the other temperatures (P<0.05); corresponding values for females were 0.0022 mL/min、0.0019 mL/min and 0.0210 mL/(g × min), whereas those for males were 0.0016 mL/min、0.0016 mL/min and 0.0236 mL/(g × min). The respiratory metabolism of male and female adults underwent little change between 21 and 27℃, but respiration increased rapidly at temperatures over 30℃. Metabolic rates and O₂ uptake rates of male and female adults at 36℃ were significantly higher than those at other temperatures (P<0.05); corresponding values for females were 0.0592 mL/(g × min) and 0.0071 mL/min, and for males were 0.1108 mL/(g × min) and 0.0089 mL/min. However, CO₂ release rates of male and female adults were 0.0074 mL/min and 0.0067 mL/min, respectively, at 39℃; significantly higher than at other temperatures (P<0.05). [Conclusion]  G. sibiricus is likely to remain an important pest in Xinjiang alpine and subalpine grasslands despite global warming.