Abstract: In order to further understand the ecological problems of Song-nen Plain and Liao-he Plain,the geomorphology and digitized information of land use for Song-nen plain and Liao-he Plain were investigated,and land eco-types were classified based on the limiting factors from the soil and indicative plants.Song-liao Plain (Song-nen Plain and Laio-he) could be divided into six types of land forms,including low tableland,extremely high plain,high plain,while land use pattern is divided into nine kinds,involving forest land,meadow,and farmland.The new schedule for the land eco-types is sweet land,saline and alkaline land,water mash and wetland as well as sandy land.The ecological problem and management strategies of each land eco-type were discussed.Besides,the ion accumulation theory in saline and alkaline region is indirectly demonstrated by the distribution of saline land proportion in different land form.