Abstract: Different concentration of NaCl was used to treat the seedings of wheatgrass,we studied the effect of salt stress on fresh weight and ion content of leaves of wheatgrass.The result showed that wheatgrass seedlings can keep growth in slight salt stress.But in middle or severe stress,growth of the seedlings was restrained distinctly.So we considered that the seedlings of wheatgrass can prevent Na⁺ from transporting to upgroud by withholding Na⁺ in root.This can keep the balance of ion of upground.But in middle or severe salt stress,the upgroud of seedlings accumulated superabundance of Na⁺,limited the uptake of K⁺ and Ca²⁺,seedlings was damaged heavily.

Key words: NaCl stress, Agropyron mongolium Keng, growth of seedlings, content of severalions