Abstract: Landsat TM (ETM) images acquired in 1986 and 2001 and the RS-GIS integrated technique are adopted to quantitatively analyze the present situation, degrees and developing trend of salinized-alkalized land in Songnen plain. It is concluded that, during the 15 years, the area of salinized land has increased 21.7112×10⁴ hm², averagety 1.45×10⁴ hm² per annum, with average annual increase rate of 1.4%. Among them, the salinized areas in light-degree, mediate-degree and heavy-degree have increased respectively by 0.8812×10⁴ hm², 3.8306×10⁴ hm² and 16.9994×10⁴ hm², with average annual increase rate of 0.16%, 0.64% and 4.2% respectively. The main drives for the increase of salinization are the warming climate, reduced precipitation and increased human activities.