As an important part of test system of aero craft, missile-borne data recorder is used to record all kinds of parameters during launching and flying of the aero craft. We designed the missile-borne data recorder for a type of guided missile; System is able to save multiple analog and digital signals in the flash drive under the control of DSP. In this way, the real time recording of key testing data of researching of weapon is achievable. After many times of marching test, the system works properly, and meets the design criteria fully.