Soil salinity is becoming an increasingly serious constraint to plant growth in many parts of the world; this is particularly common in semi-arid and arid zones.This study was conducted to evaluate the effect of different concentrations of salt on seed germination and seedling growth of Acacia albida and A.salicina.Collected seeds were treated with H2SO498% for 35 min then left to germinate in a controlled growth chamber.Seeds were grown at salinity levels of 0.1, 0.2 and 0.3 mol L-1of NaH2PO4.H2O.Germination parameters and seedling growth indices were measured after 35 days.The mean of total length of A.salicina in all salinity concentrations was more than that of A.albida.The fresh weight of stem and root of A.albida was more than that of A.salicina.Growth of control seedlings was higher than for other treatments and the fresh weight of stems of two species at salt concentrations of 0.2 and 0.3mol L-1decreased with increasing concentration of salt.Most control seeds germinated at salinity of 0.1 mol L-1and germination index, final germination and seeds stamina was greater at low levels of salinity. Soil salinity is becoming an increasingly serious constraint to plant growth in many parts of the world; this is particularly common in semi-arid and arid zones. This study was undertaking to evaluate the effect of different concentrations of salt on seed germination and seedling growth of Acacia albida and A. salicina.Collected seeds were treated with H2SO49% for 35 min then left to germinate in a controlled growth chamber. Seeds were grown at salinity levels of 0.1, 0.2 and 0.3 mol L-1 of NaH2PO4.H2O. Germination parameters and seedling growth indices were measured after 35 days. the mean of total length of A. salicina in all salinity concentrations was more than that of A.albida.The fresh weight of stem and root of A.albida was more than that of A.salicina . Growth of control seedlings was higher than for other treatments and the fresh weight of stems of two species at salt concentrations of 0.2 and 0.3 mol L-1 debased with increasing concentration of salt. Most control seeds germinated at sal inity of 0.1 mol L-1 germination index, final germination and seeds stamina was greater at low levels of salinity.