Monitor and Analysis on Optical Observing Conditions at Nanshan Observatory

We introduced our approaches on monitoring the astronomical seeing, night sky brightness and weather condition by using the equipment of SBIG、SQM-LE at Nanshan Observatory. Statistical analysis and results are presented and discussed after removing the flawed data. Our analysis revealed an astronomical seeing of about 1.74", night sky brightness of 21.7mag arcsec^-2, average temperature of 3.4℃ and average relative humidity of 57.3% for Nanshan. The winds are in the range of 2-3m/s, most in south-east direction. The long-term observations support Nanshan Observatory to serve as an appropriate site to operate small and middle scale optical telescopes. Furthermore, our results provide comparison and reference information for other optical sites in China.