The concentration of atmospheric ice nuclei was observed in Tianshan Mountain area from June to July in 2001.Daily variation and Interdiurnal variation of the average concentration of atmospheric ice nuclei were investigated.Relationship between the concentration of atmospheric ice nuclei and affecting meteorological factors was investigated and some possible reasons were addressed.The results show that atmospheric ice nuclei in Tianshan Mountain area comes from soil and is depleted in the air.The concentration of atmospheric ice nuclei depends on meteorological and ground conditions,and changes significantly not only within a day but also from day to day.