By using a millipore filter method,the essay makes ice nuclei observations on the North slop of Mid-Tianshan Mountains area Xinjiang from June 12 to July 31, 2001.it is found that the observed atmospheric ice nuclei is so thin in the area,it is only 0.32·L^-1.The analysis shows that the concentration of atmospheric ice nuclei maintains close links with activity of air mass,precipitation and wind directions.