Soybean breeding shows that soybean resources are increasingly narrow due to the depletion of ancestral varieties. We collected salt-tolerant wild soybean samples and seeds from 23 areas affected by heavy salt stress. SEM was used for structural evolution, Plant Print identification, salt and alkali resistance physiology, salt resistance gene and tissue culture experiments. We report here the discovery of Chinese wild soybean salt gland is first reported in the world. The salt tolerance of new soybean varieties is greatly improved by breeding wild soybean with salt gland as the male parent. A batch of new soybean varieties resistant to salt were obtained. The experiment revealed that the diversity of salt tolerance function of wild soybean was closely related to stress tolerance physiology, stress tolerance gene and phylogenetic structure evolution. Our results encourage the use of salt-resistant wild soybeans as paternal breeding to avoid undesirable breeding cycles at the expense of soybean ancestral varieties.