Based on landscape ecology, remote sensing and Geographical Information System technologies, the dynamic change of mire in Sanjiang Plain is analyzed. The results show that mire is mainly distributed in the counties of Fujin, Tongjiang and Fuyuan, whose area accounts for 51.42% of the total area of mire in Sanjiang Plain. The area of mire decreased greatly from 1980 to 2000, especially from 1980 to 1996, it decreased to 51.33%. Since 1996 the decrease speed of mire′s area has become slow. The results als...