Abstract: The carborne γ spectrometer is mainly used in the areas of radionuclide activity measurement, searching for radioactive sources and nuclear pollution detection, and the digital pulse processing technology is an effective way to improve the sensitivity and rapid response of carborne γ spectrometer. The system of digital carborne γ spectrometer was developed to support 1-5 4 L large volume NaI (Tl) crystals in this paper. The system used digital pulse processing nuclear technology to obtain multiple independent NaI (Tl) spectra, and transmittes spectrum data to the military computer via WiFi, fast Ethernet, RS232. This system achieves the functions of nuclide identification, digital mapping, color spectrum display, ROI monitoring and data playback. The results show that the system using digital technology can enhance the energy resolution of carborne γ spectrometer, identification ability of low-energy ray and energy nonlinearity, and has a more stable and accurate digital spectrum stabilization effect. The system is stable and reliable, and can be used for radiation resource exploration, fast nuclear accident emergency, nuclear contamination monitoring, and radiation source search.