Abstract: A high precision and full autocontrol real-time measurement and remote control covering visible near infrared multi-wavelength sun photometer PSR-2 was developed. It can realize real-time measurement and display of direct radiation irradiance of the sun, sky radiance (main plane, equal zenith angle), aerosol optical thickness, atmospheric column water vapor content and ozone content.And it has the functions of simultaneous detection, accurate temperature control, accurate sun tracking and other detection functions. PSR-2 was improved on the basis of PSR-1, which had been tested for long time desert wind sand and rainwater erosion. It is characterized by long time effective stable observation, more miniaturization, more convenient data processing, and higher performance and price ratio. In addition, the Langley method calibration and temperature control performance test were carried out on the instrument in Dunhuang. Results show that the PSR-2 Langley calibration fitting linear correlation is higher than 99%, the constant temperature warehouse temperature is stabilized within (25±0.3)℃, the PSR-2 aerosol optical thickness and the large column water vapor content deviation are within 0.02 and 0.1, respectively, compared with the actual measurement results in Hefei and Dunhuang by the foreign industry standard of CE318. Finally the error analysis was carried on.