In order to investigate the effect of drought tension during the flowering stage on proline content, total soluble carbohydrate, fructose, glucose and sucrose in bean leaves, an experiment was conducted as split plots based on randomized complete blocks design with three replications. Main factor included four cultivars of bean (Taylor, COS16, Khomein and Akhtar), sub factor consisted of drought tension in three levels (30, 60 and 100 percent field capacity) and sub-sub factors was tension duration in two levels (three and nine days). The results showed drought tension decreased the relative water content and sucrose significantly and increased the amount of and electrolyte leakage, total soluble carbohydrates, fructose, glucose and proline. There was a significant negative correlation between relative water content and electrolyte leakage, soluble carbohydrates in water, fructose and glucose content. In conditions of water tension, accumulation of soluble carbohydrates and proline in Taylor and COS16 tolerant cultivars was more than sensitive Akhtar was Khomeini. Increasing time duration of tension from three and nine days caused a significant increase in proline, glucose, fructose and total soluble sugars amounts. The interaction effect of tension × cultivar and tension × time on all evaluated traits was significant, while the cultivar × time duration interaction had a significant effect on electrolyte leakage, proline and total soluble carbohydrates. The results of this investigation showed that proline and carbohydrates are involved in tension tolerance mechanisms and their metabolism is influenced by soil water tension.