The present work made to the effect of HgCl2 on seed germination, chlorophyll and protein content of Arachis hypogeae. L. The pot culture experiment was conducted with various concentration (1, 2, 3, 4 and 5 mg/L) of HgCl2. The results were showed significantly (p > 0.05) affected the seed germination, contents of chlorophyll a & b, total chlorophyll and protein on Arachis hypogeae .L compared to control with increasing treatment of HgCl2.