This paper first analyzes the significance of shock wave Mach angle in the study of supersonic flying objects and points out the shortcomings of testing methods for shock wave Mach angle in modern shooting range tests. A new measurement method for shock wave Mach angle，projectile velocity，and projectile flight distance is proposed. By analyzing the time at which the shock wave is received by the shock-wave acoustic piezoelectric sensor and the time at which the supersonic flying projectile is obscured by the high-speed target detector，and combining the spatial information of the two detectors，a mathematical model for the external ballistic parameter testing system based on acoustic and optical dual signals is constructed. Simulation model analysis shows that the error of the projectile Mach angle based on the acoustic and optical dual signals is less than 0.6%. Experimental results show that for supersonic flying projectiles，the ballistic parameter measurement system based on acoustic and optical signal detection system has a high measurement accuracy.