Abstarct: Medicinal plants are important economic plants and their effectiveness and relative safety make them grow. In order to investigate the density of planting, mycorrhizal fungi and foliar spraying of fulvic acid on the growth characteristics, yield components and photosynthetic pigments of sour tea plant, an experiment was carried out in the agricultural year of 2019-2019 in the research farm of Sabzevar Agriculture and Natural Resources Research Station. The experimental treatments include density as the main factor at two levels of row spacing of 50 cm (6 plants per square meter) and 75 cm (4 plants per square meter) and foliar spraying with fulvic acid at three levels (water control, 500 and 1000 mg/l ) and mycorrhizal fungi at two levels (use of Glomus mosseae and non-use) were as secondary factors. The results showed that with the increase in density, the weight of bolls, fresh and dry weight of sepals and the number of bolls per plant decreased in a single plant, but due to the nature of more plants per square meter, the above traits were more in the density of six plants per square meter than the density of four plants. It was in square meters. On the other hand, in all the measured indicators, the use of mycorrhizal fungi and foliar application of fulvic acid from zero to 1000 mg/liter was superior to the absence of biological fertilizer. As a final conclusion, it can be confirmed that the use of mycorrhizal fungi and fulvic acid with a density of six plants increases the growth and functional characteristics of sour tea.