This study was conducted to evaluate response red bean (CV. Goli) under drought stress conditions for three types of biological fertilizers in 2014 - 2015 years. A split plot experiment was conducted in Tabriz, Iran. Irrigation levels (irrigation after 70, 110, and 150 mm of evaporation from pan) were considered as main plots, and biological fertilizers Rhizobium (Rp), Mycorrhiza (My), Pseudomonas (Ps), Rp + My, Rp + Ps, Rp + My + Ps, and non-inoculation (control) were considered as sub plots. Combination of Rhizobium, Mycorrhiza, and Pseudomonas at irrigation level of more than 70 mm of evaporation had the highest grain yield, RWC, CCI, stomata conductance, leaf water potential and lowest cell leakage. Triple inoculation increased grain yield in comparison to the control, or to the time they were used individually or simultaneously; it also reduced the negative effects of drought stress on the beans.