<p>A three-component stress-wave force balance system for measuring lift, drag, and pitching moment of scramjet model in a shock tunnel was designed and tested under Mach 6 flow condition. To isolate the system from external disturbances, an aerodynamic shield was designed, vibration isolation mounts were used, and stress bars containing strain gauges were installed between the model and vibration isolation mounts. To increase signal-to-noise ratio of stress waves, brass was chosen for the stress bar, and scramjet model with no non-metallic parts was used. Dynamic calibration using an impact hammer and calibration lugs was conducted at eight calibration stations to obtain the system impulse response functions. A quarter-type Wheatstone bridge was selected to enhance the force recovery capability of the system. The designed system was applied to shock tunnel tests, and the mean values of the three-component forces and their coefficients were calculated within an effective test time.</p>