The pieces of dyed filter paper were exposed to rain, and both the size and position of the drops were determined. Lovejoy et al.(1990) reported that the spatial distribution for raindrops was fractal. Therefore this inhomogeneity of raindrops will lead to the correction for the standard theory in radar rainfall masurement. In this study, the fractal dimension of spaital distribution for raindrops are calculated, and are extended to the rainfall rate and the dropsize. This calculation gives the suggestion that the spatial distribution has the pink noise.