The wide interaction of genotype × environment makes a researcher to have the yield of genotypes be evaluated in a vast scope of environmental conditions, until the required information (to increase the efficiency related to their selection and introduction) is achieved. In order to evaluate the stability and determine the highest yielding and adapted genotypes of hulless barley, 20 genotypes were studied in a Randomized Complete Block Design with three replications in six locations (of Karaj, Esfahan, Neishaboor, Yazd, Birjand and Zarghan for 2 years (2001-2003). Simple and compound analysis of variances indicated significant differences among genotypes. To evaluate the interaction and determine the stable genotypes, the stability analysis was done by use of environmental variance, environmental coefficient of variation, Eberhart and Russell's regression method, Finlay and Wilkinson's regression Coefficient, Perkins and Jinks's regression method, equivalence of Wrick, stability variance of Shukla, the average and deviation from rank and yield index ratio. The results of these stability procedures were somehow similar and mostly indicated the same. On the basis of most of these methods ICN93-328 and Aleli/4/mola2 genotypes were identified as the stable ones, Gloria genotype being recognized as especially suitable for the unpropitious poor areas.