In the design of hydraulic structures and water resources management; need to inform the discharge values at different probability levels in a basin. The major problem in this regard is the ungauged basins or with short time data basins. One of the suggested methods to overcome this problem is the regional flood frequency analysis. The determining homogeneous areas should be done before Regional flood frequency analysis. This study examined four homogeneous methods; including Dalrymple, Andrew curves, cluster analysis, Hosking and Wallis; and then their results were analyzed. In this study number of selected stations were 112. Physiographic, climatic and hydrological features of basins were extracted by ARC GIS 9.3. Dalrymple test was conducted on peak flow and Andrew curves method was done using physiographic, climatic and hydrological variables. Ward cluster analysis method was performed in SYSTAT 13 software. Hosking and Wallis method was calculated measure of discordance D i and heterogeneity measure H i on the hydrological statistical properties. It also using Z DIST was chosen appropriate regional distribution. Hosking and Wallis method provide more performance results and Dalrymple method is less accurate than other methods. Key words : Regional flood frequency analysis, regionalization, regional distribution, homogeneous tests, Dalrymple method, Andrew curves, cluster analysis, Hosking and Wallis, L-moment ratio diagram
