Based on high-speed FPGA technology， the driving research of collecting spectral signal was realized by using line array CCD controlled by external trigger synchronization according to external demand. According to the test data in this paper， it could be seen that the fixed delay time of the designed circuit board was 2.809 9 μs， and the delay accuracy was no more than 86.1 ns， and the spectral signal collected by the linear array CCD could meet the requirements of spectral analysis. This paper designs and realizes the optical signals collected by the external trigger mode to control the TCD1304， providing application reference for later industrial testing.