One of the important methods to solve the problem of the river basin so far short of observed data and to determine the design flood flow lies in estimating the statistical parameter and calculating the design flood flow by meams of Pearson Type 3 freqency curve. This paper is aimed at the medium and small basins in Fujian, the areas of which are less than 1100 square kilometer. The empiric formula which deals with the mean annual flood peak discharge(Qm), the figure of the isogram of deviation coefficient(Cv) and the figure df the ratio of skewness Coefficient(Cs ) to deviation coefficient(Cv) for the divided districts are given in this paper. The materials mentioned above are based on the data of measurement and of the investigation on the biggest flood in history. on the other hand, they are written by analyzing the statistical parameter of the annual flood peak discharge in each station and by consulting the distribution law of statistical parameter of storms in various districts of Fujian. The empiric formula and these figure data can be applied to any programmor project design for medium or small basins in Fujian Province.