Abstarct: The use of natural ability of leguminose plants in air nitrogen fixation by symbiosis with rhizobium bacteria, is an interesting tool to the supply of nitrogen for plants and reduce the risks of chemical fertilizers. Sucrose and molybdenum from those substances that can increase the efficiency of nitrogen fixation with impact on symbiotic relationship. To investigate this subject, an experiment was conducted in 2015 at the research farm of Shahrood University of Technology on soybean. Treatments were sucrose foliar application in three levels (0, 15 and 30 g/lit), molybdenum foliar application in three levels (0, 0.03 and 0.06 g/lit) and rhizobium bacteria in two levels (non inoculation and inoculation) as a factorial baxsed on randomized complete block with 3 replications. Seeds were inoculated with bacteria before planting and spraying was done once at the time of flowering. The results showed that the inoculation with rhizobium bacteria before planting on all agronomic and morphological traits studied had a significant impact and improved them. specifically, Inoculation increased yield and Percent of seed protein. Sucrose foliar application on dry matter accumulation, many agronomic traits, yield and physiological traits were effective. This treatment increased membrane stability and the sugar solution and improved oil yield by 9.12 and 19.81 percent than control, respectively. Foliar application of molybdenum also significantly increased yield, yield components and some physiological traits such as chlorophylls and carotenoid. Application of this matter increase molybdenum, iron and nitrogen in leaves. From interactions effects, the interaction of seed inoculation with molybdenum foliar application with 0.06 grams per liter was effective on more traits. Study of interaction between sucrose and molybdenum showed that spraying 30 grams per liter with 0.06 grams per liter of molybdenum in most traits were useful. Finally, seed inoculation before planting and foliar application with the highest concentration of sucrose and molybdenum improve the quantity and quality traits in soybean.