The effects of drought on chlorophyll fluorescence characteristics of photosystem II (PSII) in young bean plants (Phaseolus vulgaris L.) – cv. Lodi and cv. Cher Starozagorski, were studied. Drought conditions were imposed on 2-weekold plants by withholding water for 10 days. It was found that drought stress increases ground (F0) fluorescence and decreases maximal (Fm), and variable (Fv) fluorescence, as well as Fv/Fm parameter in dark adapted leaves. In light adapted leaves a significant decrease in quantum yield (Y), photochemical quenching (qP) and electron transport rate (ETR) of PSII was occurred. In conclusion, it is considered that in cv. Cher Starozagorski photosynthetic apparatus is more tolerant and in cv. Lodi photosynthetic apparatus is more sensitive to drought.