The Ice-grass ecotone is an important part of Ecotone. Analyzing the environmental features of the Ice-grass ecotone has great significance for protecting the fragile ecological environment under the background of global warming. Take the Tizinafu River Basin mountainous unique Ice-grass ecotone as the research subject,based on MODIS products,using remote sensing techniques for qualitative and quantitative analysis of its environmental characteristics. The results showed that: In the Ice-grass Ecotone year-round low temperature,the annual average temperature was -4.79℃,from May to September temperatures above 0℃, which was the main snowmelt period, the total amount of snowmelt was 5.4 * 10~8 m~3,which accounted for 70.03% of Tizinafu River water runoff. The water is an important water supply of Yerqiang Oasis, in September of that year to the following May with temperatures below 0℃,this period was mainly of snow; In the development of the primary stage of cold-frozen soil and colddesert soil is widely distributed within the Ice-grass ecotone, freeze-thaw desertification widespread and serious, vegetation is extremely sparse; The Ice-grass Ecotone included stream rock slope, pour rubble, sparsely - vegetated of the high mountain,three extremely arid landlocked plateau desert landscape types.