Flight altitude of projectile is an important control parameter in the control of guided projectiles. A high precision altitude measurement system with temperature compensation and altitude correction function was designed for achieving projectile flight altitude dynamic information acquisition, storage and real-time monitoring. With advantages of small volume, energy efficient, rapid response and anti high overload, the system consists of ATmega16, digital pressure sensor, memory chip and host computer. According to experimentation, the system can bear impact overload to be up to 15000g. The altitude error of system is less than 5 m. It can fully meet the requirement of anti high overload and accurately measuring the altitude.