For the purpose of real-time and synchronization acquisition of compound data in distributed anti-aircraft gun system, to solve the problem of asynchronous data affect the accuracy of the measurement system, a synchronous acquisition system of distributed anti-aircraft compound data is put forward. The system is composed of multiple composite data acquisition terminals. The compound data acquisition terminal based on I.MX515 ARM processor and Linux real-time operating system has the function of complex data real-time acquisition and GPS interface. Use GPS timing synchronization between multiple composite data acquisition terminals and timestamp synchronization technology to ensure that the data of time correlation. Results show that the system design is reasonable, and can keep the original data synchronization to improve the accuracy of the evaluation system of weapon shooting and robustness. It has been used in certain type artillery firing evaluation system.