The formation of salt-alkaline soil included salinization and alkalinization. The increase of salinity was the character of salinization, and the increase of pH was the character of alkalinization. The aim of this experiment was to show the characters that salt-alkaline mixed stress on plant and the correlativity between saline stress and alkaline stress. Seedlings of sorghum (Changbang 128) were stressed with 28 kinds of mixed salt which were composed of NaCl, Na2SO4, NaHCO3 and Na2CO3 at vario...