Abstract: The study area was conducted in meadow Alkaline soil at the Tumochuan plain.The research target grassland was improved by desulphurization gypsum before 5 years and kept grazing to now.The saline-alkali soil characteristics and stability were analyzed concretely.Effect in improvement of alkaline soil were analyzed through the method of plot experiment with located monitoring.The results showed： the degree of alkalization of each treatment kept essence of stabilization in the 0cm - 20cm soil layer and 20cm-40em showed the rising tread, but it was less than the control;it is obvious effect that was improved. All of the soil pH values were rising at 0em-20cm layer and there were less that 9.0 that it was still lower than control.The pH values change very slowly that it had a better stability. The total salt of each improved treatment are decreased at 0cm-20cm soil layer and 20em-40em soil layer has different trends. It indicates different treatments showed different improved effect and stability.In the 0cm-40cm soil layer, the content of salt results is lower in 2011 than 2006,it is more validate 52 is the optimum treatment area.