Aiming at the application requirements of spectral observers for test site calibration of satellite remote sensors, we designed a spectral radiation acquisition circuit system with visible near-infrared (0.4 μm~1.0 μm) ,and conducted the analysis on the application and data combining with the spectral radiation acquisition module. We mainly introduced the selection and driving requirements of the linear array detectors , the design based on STM32 microcontroller unit (MCU) was completed. According to the radiation observation requirements，we processed the analog output signal of the linear sensor by instrumentation amplifier in the signal processing section，and used the A/D converter in STM32 for collection.By analyzing the results of digital signal output，the data collection of the radiation measurement system has achieved the accuracy of 1LSB (less than 0.8 mV). Furthermore, we applied the detector circuits system to the spectral radiation acquisition module, and carried out the outdoor application and data analysis . Results show that the deviation of the comparison result of spectral irradiance is less than 5%. The comparison results of the spectral irradiance prove that the whole system can be directly applied to the product and meet the reliability acquisition of field radiation measurement.