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In order to Record parameters on high reliability electronic equipment，a tata recorder is designed,the timing of each interface of the data recorder is also studied. The interface of the data recorder is analyzed in real time,according to the speed and time requirement of recorded data,PL designs interrupt mode and ping-pong buffer,and obtains the optimal recording mode.PS is processed according to the priority of recorded data,Improving software instruction and interrupt processing.Experimental results indicate that the optimized software has shorter interrupt response time．The moving time of image data can reach 90 microseconds. The moving time of sync-uart data can reach 740 microseconds. The system test shows that the system has the characteristic of simple operation and high efficiency,at the same time release the main CPU,that it can meet the real-time requirement of UAV for data recorder.