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With the development of computer technology, aeronautical radioactivity gamma spectrum measurement technology has constantly developed and improved, and the identification accuracyhas also reached a higher level, which provides more abundant and accurate measurement information for aeronautical radioactivity gamma spectrum prospecting and aeronautical radioactivity environment measurement. Design of 1024 Channel Aeronautical Gamma Spectroscopy instrument is based on FPGA technology. It contains the hardware circuit of 1024 channel aeronautical gamma spectrum instrument and the function of multi-channel energy spectrum analysis software embedded in FPGA.It realizes the acquisition of radioactive gamma ray and the high speed analog digital conversion, as well as the storage and graphic display of radioactive 1024 channel full spectrum data, which plays a positive role in promoting the development of independent research and development of aeronautical gamma spectrum instrument.