Abstract: Agroecological environment in Northeastern China could be greatly by affected the warming climate. Its variation tendency will be: 1) heat condition becoming favourable to crop growth, 2) growing period be lengthened, 3) frequency of cold damages be decreased, 4) period of snow accumulation be shortened, 5) humid condition becoming unfavourable to crop growth, and 6) drought frequency and evaporation be increased. If average temperature raises 2℃ caused by the warming climate, grain yield in Northeastern China will increase 36% or so, and agricultural zones will move greatly toward north. Thus, corresponding countermeasures must be adopted,

Key words: Warming climate, Agroecological environment