Traditional ground object spectrometers have high requirements for optical signal intensity and can only be used during the day but cannot be used at night, which leads to high uncertainty of on-orbit radiometric calibration of remote sensing at night. A technical solution is proposed to enhance the information acquisition capability of the spectrometer under low illumination conditions by directly coupling the traditional spectrometer′s CCD (Charge-Coupled Device) detector with the image intensifier. Based on this technology scheme, the spectrometer could effectively measure ground targets′ spectral information at night. The experimental results show that the low-level light spectrometer can effectively measure the spectral information of the ground target with good and stable performance under the condition of moonlight and starlight. And the spectrometer can be applied to night remote sensing calibration, night target spectral information acquisition, and other application fields, laying a technical foundation for improving the accuracy of night remote sensing calibration in orbit.