Abstarct: Seed vigor is the first traits of the seed quality that decreases by aging, followed by a decrease in germination capacity, seedling growth and establishment. Hence, to stimulate germination and increase the establishment of seedlings in aged seeds, treatment can be done using different materials such as ellagic acid and brown seaweed extract (Ascophyllum nodosum). To investigate the effect of seaweed extract and ellagic acid on agronomic and physiological responses of soybean plants grown from soybean normal and aged seeds, an experiment was designed and implemented in the laboratory and field in faculty of Agriculture of Shahrood university of technology during 2019 and 2020. The laboratory section divided into two individual parts; In the first part of the experiments, two sets of soybean seeds (aged and normal seeds) were pretreated with ellagic acid at seven levels (zero, distilled water, 25, 50, 75, 100 and 125 mg/L). In the second part, the aged and normal seeds were pretreated with seaweed extract at seven levels (zero, distilled water, 0.1, 0.2, 0.3, 0.4 and 0.5 %). In both, a pilot study as a factorial experiment with a completely randomized design (CRD) in three replications was carried out under a germinator environment. In a farm research, a factorial experiment baxsed on a randomized complete block design (RCBD) in three replications was conducted for two years. In this section, two sets of seed (aged and normal seeds), the seed pretreatment and foliar spray treatment with ellagic acid and the seaweed extract was conducted at three levels (zero, 50 mg/L of ellagic acid and 0.3 % seaweed extract). Foliar application was done at the beginning of flowering. The results showed that the seed aging reduced the germination percentage, α and β-amylase activity in the laboratory conditions and also, decreased the final emergence percentage in the field condition. Whereas, the seed pretreatment with the seaweed extract and ellagic acid increased these traits. The seed aging increased protease activity, phospholipase, lipoxygenase, SOD, catalase, reactive oxygen species, malondialdehyde and electrical conductivity in seeds. glutathione content, ascorbat peroxidase and PAL activity decreased in aged seeds. Also, the amount of the malondialdehyde, the activity of lipoxygenase, flavonoids and anthocyanins content increased in the leaves of plants grown from the aged seeds in the field conditions. The seed aging reduced glutathione content, protein yield and seed yield in plants. However, pretreatment of the seeds with ellagic acid and the seaweed extract increased protein yield by 27.24% and 53.39% respectively and also, seed yield in plants grown from seeds treated with ellagic acid increased by 28.15%. The seed yield increased by 53.57% with the application of seaweed extract as seed pretreatment, also foliar spray of ellagic acid and the seaweed extract increased protein yield by 20.61% and 21.51%, respectively. The foliar spray of ellagic acid and the seaweed extract increased seed yield by 20.87% and 21.36%, respectively. In the scope of this research, it can be suggested that the seed pretreatment and foliar spray of ellagic acid and the seaweed extract improves the effects of the seed aging in soybean. In this study, the application of these two substances as seed pretreatment performed better than foliar application.