Abstract: Based on field investigation of species and their distribution,frequency and coverage at selected 30 sampling sites in Fushun District, Northeast China,the IAP(Index of Atmospheric Purity)was calculated. 159 species belonging to 91 genera and 41 families of bryophytes were recorded in the district. According to the results,the area investigated could be divided into four regions: 1)seriously polluted region: species of bryophytes less than 4,IAP<4,no epiphytic bryophytes,with air-quality > class 3 of National standard; 2)polluted region: species less than 10,IAP<15,no epiphytic bryophytes,with air-quality equal to Class 3 of National standard; 3)relatively clean region: species less than 20, IAP < 25,occurrence of epiphytic bryophytes, with air-quality equal to Class 2 of National Standard,and 4)basically no-polluted region: species more than 20, IAP>26, rich in epiphytic species, with air-quality clean. Pylaisiella polyantha(Hedw.)Grout., Anomodon minor(Hedw.)Fuernr., Atrichum undulatum(Hedw.)P. Beauv. and Plagiomnium cuspidatum(Hedw.)T. Kop. could be selected as indicate species to air-pollution in the district.

Key words: old industrial relocation area, remote sensing, GIS, land use, driving force.