The photomultiplier detector system is consisted by NaI(T1) and CsI(Na). The energetic radiation under the thunderstorm condition was preliminary observed using the detector system. Through the analyzing, the energy of energetic radiation under the thunderstorm condition was more complex than that of fine condition. The energy under thunderstorm condition was higher about 6 000 keV to 10 000 keV than that of fine condition. When the electric field caused by the thunderstorm was stronger, the energy was detected by the detector quite higher. But the energy was decreased when the field caused by the thunderstorm was weaker. It showed that the energy of energetic radiation was increased under the thunderstorm condition.

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