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The motion parameters of the projectile in the bore can reflect the working state characteristics of the artillery. Aiming at the speed measurement requirements of the interior ballistic motion of the conventional artillery projectile, an inertial velocity measurement system in the bore based on MEMS acceleration sensor and attitude sensor is designed. Kalman filtering and quaternion attitude algorithm are used to process the sensor data on FPGA chip, realizing the time recording of the movement process from the projectile squeezing in to the chamber exit, and successfully obtaining the acceleration, velocity and displacement changes in the interior ballistic movement process of the projectile. The experimental results show that the measurement error of the exit velocity of the system is less than 2.93% compared with the laser zone cut velocity measurement method; Compared with the original parameters of the gun barrel, the measurement error of the bore out displacement is less than 1.85%, which provides technical support for the measurement and acquisition of the projectile motion parameters in the interior ballistic process, and is of great significance to the design and evaluation of the gun system.