Abstract: Using saline soil and wild soybean as object, the amount of N of wild soybeans’ root, stalk and seed and N, Na+,K+,Ca2+,Mg2+,Cl-,HCO3-,SO42-and CO32-in the soil was measured. The research discussed what effect the wild soybean would produce to saline soil. The results showed that the amount of N in saline soil would be validly increased by planting wild soybean in the saline soil at pot. In the terms of flower and harvest, the amount of N in the soil was more 98 and 113% than that in the uncultured saline soil. The amount of ions in the soil with dissolving water and its sum were decreased by planting wild soybean in the saline soil at the pot. In the term of harvest, the amount of Na+,Cl-,HCO3-and SO42- in the soil at the pot was less 95.2,85.3,47.6 and 95.5% respectively than that in the uncultured saline soil; the sum amount of water-solubility saline ions in the soil was less 90.5% than that in the uncultured saline soil. It would produce the effect of meliorating saline soil at the pot. In the term of harvest, the over ground biology quantity of the wild soybean was very large and wild soybean would grow in every salinity of the term of growing. It would make the saline soil be covered with plants