Abstract: Based on the statistical analysis of 448 times rainstorm in 13 medium and small watersheds on the Loess plateau, the nonuniformity of spatial distributions of different patterns of rainstorm in this area were systematically studied, inculding deviation coefficient of areal rainfall of watershed, non-unifom coefficient of rainfall, raito of maximum point and minimum piont rainfall, relationship betwwen point rainfall and areal rainfall, and spatial correlation characteristics of rainfall amount,ect.