Chrysanthemum morifolium is an ornamental medicinal plant grown in different parts of the world. In order to investigate the effects of salinity stress on morphological characteristics and phenolic compounds and antioxidant activity of Chrysanthemum, a research experiment was carried out in a research farm (Chah Anari) of the Faculty of Agriculture, Isfahan University of Technology in 2017 in a completely randomized design in potted condition. The experiment consisted of ten genotypes of Chrysanthemum with four levels of zero, 30, 60 and 90 ds/m and three replications at each level. Potted soil was a mixture of soil and sand with the ratio of 2 to 1. Because, the aim of the reserch was to study the salinity on the flower of this plant, the stress was applied from the end of September and before flowering stage, and continued until the end of the flowering stage. At the end of the experiment, morphological traits including plant height, flower diameter, petal width and length, flower number, flower fresh and dry weight and phenolic compounds, total flavonoid content, iron recovery percentage (FTC) and inhibitory percent at 50 and 300 mg/l were measured. The results showed that salinity had a significant effect on plant height, fresh flower weight, dry flower weight, flower diameter, petal width and length, phenol content, total flavonoid content, and restorative strength and inhibitory percent. This experiment showed that salinity was associated with lowering height, decreasing flower diameter, decreasing flower number, decreasing the length and width of petals, and the minimum height, flower diameter, flower number, length and petal width at 90 ds/m. Also, salinity decreased fresh and dry weight, but it should be noted that at higher salinity levels, the difference between the fresh and dry weight was low. In contrast to morphological traits, phytochemical traits did not follow a particular trend and different genotypes in each level of salinity reacted differently from the other level. Consequently, the Chrysanthemum, unlike its high drought tolerance, does not tolerate salinity over than 30 ds/m. In another study, from primary germplasm, twelve varieties were selected based on the color difference, purity, and late and early flowering, and their self and open-pollinated seeds were harvested. Genotypes were cultivated in a completely randomized block design after tralanting in the field. This study, which was conducted to differentiate the first-generation morphological traits from self-pollination and open pollinated one, showed that mostly self-pollinated plants produced smaller plants that have fewer flowers, and are almost late in flowering. It seems that using successive selfing, can be beneficial for further in breeding purposes in this plant. Key words Chrysanthemum morifolium, salinity stress, self-pollination, open-pollination, phenolic compounds, flavonoid