For aircraft thrust vectoring test

two six-component strain-gauge balances and an air-line bridge were applied to respectively measure the performance of the whole aircraft and nozzle at the same time. Based on the finite element software

the strains of two balances and the interference of the air-line bridge on balance were analyzed. The results showed that the interference values of air-line bridge to the force components were better than 5%

and the interference values to the moment components (except for rolling moment) were better than 15%

which reached the design index. By calibration

the formulas of single balance and balance with air-line bridge (pressurized and non-pressurized states) were obtained. The calibration results showed that the comprehensive loading error of each component of the two balances was better than 0.3%

the comprehensive loading error of each component of balance with air-line bridge (pressurized and non-presswrized states) was better than 0.5%

and the interference values of air-line bridge to balance were consistent with the results of finite element analysis. Theoretical analysis and test results show that the development of balances and air-line bridge has reached the predetermined goal and its accuracy is high

which meets the requirements of the thrust vectoring wind tunnel test.