Abstract: This paper analyzed the distribution and the change trend of the saline-alkalized land in Songnen Plain since the 1950s using the data of the first and second soil investigation and the Landsat images in the 1990s. We conclude that the secondary saline-alkalized land here increased 1% - 1.4% per year. Through field investigation and sampling, we analyzed the reasons of saline-alkalization and proposed that the saline-alkalization of wetland was one of the main types and the main characteristic of the wetland degradation. According to the practical experience and achievements of the study on the saline-land management and agricultural sustainable development in Da’an Demonstration Region, we proposed the management techniques such as planting paddy field, reed and grass, forbiddening grassland, using straw to raise livestock and improving soil.