Pneumatic guns use gas cylinders to compress air and propel the projectile inside the barrel out of the chamber. Placing the parachute inside the shell can enable parachute and other parachute projects to open at a certain speed to test the strength of the parachute. However, the outlet velocity of pneumatic guns is influenced by factors such as chamber pressure, sealing degree, internal compression degree of the projectile, and environmental temperature, resulting in a high degree of randomness in the muzzle velocity, which is not conducive to the consistency of parachute opening speed. Design a pneumatic gun projectile velocity control scheme, which combines the test outlet velocity with external ballistic prediction to achieve precise control of the pneumatic gun velocity. Conclusion: The pneumatic gun projectile control system can achieve accurate prediction and control of projectile velocity, with a control accuracy better than 2 m/s.