A field experiment was conducted on Serdang soil, to study the effect of both molybdenum application and combination of Rhizobium and Azospirillum on the growth and yield of soybean crop under drip irrigation system. Factorial experiment was used with randomize complete block design (RCBD) for molybdenum and dual inoculation factors, the molybdenum levels were 0, 1, 1.5 and 10 Kg of Mo /ha, while dual inoculation contained two treatments (dual inoculation and control) with three replicates. The following parameters were measured: number of nodules, weight of nodules, plant dry weight, total nitrogen in plant, molybdenum content in plant, phosphorus content in plant, potassium content in plant, yield, weight of 100 seeds, number of pods, weight of pods and oil in seeds. The results showed that the inoculation treatment was significantly higher than non-inoculation treatment, also results showed that increasing in all parameters at 1 Kg of Mo /ha. We can conclude that the dual inoculation with molybdenum application for soybean crops caused increasing in both yield and its components.