Seed germination reflects an important stage of the whole plant life cycle. So, this experiment was conducted to study the effect of five concentrations of composite nano silica/Activated Carbon, sodium silicate (100, 300, 500, 700 and 1000 mgl-1) compared to control to compare their effects on alleviating salt stress during seed germination of fenugreek (Trigonella foenum-graecum. L) under Na+ stress (100 mM NaCl). From results it was illustrated that both of 300 and 500 mg l-1 SiO2/AC induced final germination% by (45%) compared with untreated seeds. While the rate of 300 mg l-1 SiO2/AC significantly increased vigor index, fresh and dry weight of seedlings, and germination index, conversely, it reduced the mean germination time by 56.60%. On other side, root shoot ratio was induced with 500 mg l-1 SiO2/AC by 59.57 comparing with control. It was found that applications of 1SiO2/ AC improve saline tolerance, root , growth efficiency of fenugreek