Abstract: The present study explored the effect of nitrogenous compounds on seed germination and recovery of Medicago sativa L. under NaCl stress. Six nitrogenous compounds were applied, each at eight concentrations. Seed germination percentage was determined. The results indicated that none of the nitrogenous compounds could alleviate the inhibitory effect of 250 mmol/L NaCl on seed germination of M. sativa. When salt stress was relieved, treatments at lower concentrations (0.625-10 mmol/L) showed higher recovery germination, near or above the control level, suggesting the possibility of nitrogenous compounds (nitrogen fertilizers) coexisting with NaCl. Treatments at higher concentrations (20-80 mmol /L) were divided into two distinct groups: KNO₃, NaNO₃ and (NH₄)₂HPO₄ treatments had lower recovery germination, especially little recovery for 80 mmol/L treatments, whereas NH₄Cl, NH₄NO₃ and NH4H2PO4 had higher recovery germination. These results implied that stress effect of salt was closely associated with pH, and alkaline was a priority for improving M. sativa production in saline-alkali soil.