This paper reports an application of Regional Flood Frequency Analysis (RFFA) to Hokkaido region, northern Japan, where snow-melt flood is predominant. Optimal probability density function for annual maximum flood series was selected from seven fitting methods based on goodness-of-fit-criterion. This paper calculated the scale exponents in the power law relationship between flood quantiles and drainage area in order to evaluate scaling property: e.g. simple scaling or multiscaling. As a result of the analysis, simple scaling holds because the scaling exponents slightly vary between different return period flows.