Five mungbean genotypes were planted in pots under drought stress and non-stress conditions at the individual garden, Shiraz, Iran using a randomized complete block design with 3 replications in 2010. Initiation of differential irrigation was started at 50% flowering stage and continued through crop maturity. Pots under drought stress were irrigated to FC (Field Capacity) when the weight of each pot reached to 50% of FC. Non-stress pots were irrigated every other day. The correlation coefficients are significantly positive between grain yield and root dry weight, root length, pods number plant-1, plant dry weight, pods weight and leaves number under non-stress condition. Pod length, leaves number and plant dry weight significantly positively correlates with grain yield under stress condition. The results of path analysis indicates that direct effect of root dry weight on grain yield is highest and positive under non-stress condition, indicating that direct selection to improve yield with this trait would be effective. Root dry weight has the highest indirect effect on grain yield under non-stress condition. Leaves number and plant height have the highest positive and negative indirect effects on grain yield, respectively under stress condition. The highest positive and negative indirect effects on grain yield also relates to leaves number and plant height, respectively.