A numerical investigation was performed to study the effects of pitching angle on the aerodynamic and infrared performances of a spherical convergent twodimensional vectoring nozzle under high attitude status. In the present research

the comparison with the ground status simulation was also taken into consideration. The results show that the pitch deflection has a very weak impact on the thrust coefficient and total pressure recovery coefficient of exhaust system under the pitching angle ranging from 0 degree to 20 degree. The aerodynamic vectoring angle is nearly the same as the geometric vectoring angle. The thrust coefficient and total pressure recovery coefficient of exhaust nozzle under high attitude status decrease 0.5% and 1.1%

respectively. As the total infrared radiation of exhaust system in 3-5μm band is concerned

the peak infrared radiation intensity of plume under high attitude status is only 12-24 percent of the corresponding values under ground status. For the total infrared radiation of exhaust system

the ratio of high attitude status to ground status is among 0.35 and 0.45. In general

the peak number of nozzle's infrared performance is continuously decreasing with the increase of vector angle.