An experiment was conducted to evaluate the effect of different levels of chitosan and salicylic acid on the morphological traits of the medicinal plant Galega officinalis L. in field conditions in a randomized completely design with three replications in 2017 in the research farm of Islamic Azad University, Miyaneh Branch. The treatments include foliar application with four levels of salicylic acid (0.5, 1, 2 and 3 mM/l). The results showed that foliar application of biological stimulants had a significant effect on all evaluated traits, except plant height and leaf dry weight. With increasing the concentration of chitosan and salicylic acid, the fresh and dry weight of the stem decreased so that the highest values in the two traits in the treatments of chitosan 0.4 and 0.2 g/l and 1 and 0.5 mM/l salicylic acid were seen. the highest number of leaf at a concentration of 0.6 g/l chitosan was observed. In the study of leaf and root characteristics, chitosan with concentrations of 0.2 and 0.4 g/l and in inflorescence characteristics, salicylic acid with concentrations of 2 and 3 mM/l were more effective. In general, the use of concentrations of 0.4 and 0.2 g/l chitosan had a more optimal effect on the morphological traits of the medicinal plant Galega officinalis L.; which is ultimately recommended because of its positive effect on most of the plant's growth characteristics due to its rapid absorption in order to achieve the desired yield in a sustainable agricultural path.