According to the flight test requirements of a type of aircraft, it is necessary to adopt photogrammetry in bomb bay, install high-speed cameras at the corresponding positions of the bay, and use binocular, stereo intersection measurement method to test the weapon projection test at different altitudes, thus to detect the separation process, speed, attitude and so on of the weapon in the bomb bay.To estimate the accuracy of the airborne high-speed image testing system, and ensure the preciseness of the flight test, a method is presented for theoretical analysis on measuring precision of the airborne high-speed image measurement system.Through two experiments of freely falling body and precise rotation platform, the proposed theoretical analysis method is verified.The experimental results show that the proposed error analysis method has a guiding effect on the airborne high-speed image testing system of a certain type of aircraft, which provides a theoretical support for the measurement accuracy estimation in the following flight tests.