Abstarct: Abstract Using available and natural materials to achieve better growth of plants in the presence and absence of drought stress is one of the environmentally friendly solutions to increase plant production. baxsed on this, an experiment tixtled the effect of sugar beet molasses on some physiological characteristics and yield of bean (Phaseolus vulgaris L) under drought stress conditions was carried out as a factorial split plot baxsed on a randomized complete block design with 3 replications. The experimental treatments included the main factor, irrigation cycle (8 and 16 days) and the secondary factor, the use of sugar beet molasses as soil application (zero, 50 and 100 liters per hectare) and spraying sugar beet molasses on the leaves. The results showed that except for the weight of one hundred seeds, all investigated traits were affected by all or some of the investigated treatments. In most cases, the interaction of three factors was significant. In the conditions of 16 days irrigation cycle and no use of sugar beet molasses, the highest activity of guaiacol peroxidase enzyme was obtained. In the 8-day irrigation cycle, the highest seed yield (1.21 tons per hectare; 27% higher than control) was related to the use of 50 liters per hectare of sugar beet molasses as foliar application and 100 liters per hectare of sugar beet molasses as soil application. In the condition of low irrigation (drought stress; irrigation cycle of 16 days), this treatment combination (50 liters per hectare of sugar beet molasses and 100 liters per hectare of soil molasses) was also the best treatment combination and increased the yield by 52%. Also, spraying sugar beet molasses solution at the rate of 50 liters per hectare and using 100 liters per hectare of molasses as soil in the condition of 8 days irrigation cycle produced the highest biological yield (2.44 tons per hectare). Foliar spraying of sugar beet molasses at the rate of 50 liters per hectare and not using sugar beet molasses as soil application could create the longest pod (12.93 cm). Finally, the best concentration in this study was related to 50 liters per hectare of sugar beet molasses.