According to the water breakthrough curve and Poisssulle equation, the radius range, quantity and distribution of soil macropores covered by different land use types (secondary forest, citrus orchard, corn land, cedar forest, uncultivated land and eucalyptus forest) were quantitatively studied in granite area in southeast Guangxi. The results showed that:(1) There were differences in soil moisture breakthrough rates among different land use types. Soil water out flow rate reached a stable state in a short time, and only the stable outflow rate of citrus orchard changed greatly. (2) The soil macropore radius of different land use types was 0.4~2.4 mm, mainly distributed between 0.4~1.2 mm, the mean value was 0.85 mm, and there were a lot of small radius voidage <1.2 mm. (3) With the increase of soil depth and the decrease of pore radius, the number of soil macropores generally decreased, with fewer pores with large radius and more pores with small radius. (4) Under different land use types, soil macropores only accounted for 0.36%~6.38% of the soil volume, but their average volume of soil macropores was significantly correlated with stable outflow rate, average radius of soil macropores and saturated water conductivity, which determined the variations of stable outflow rate and saturated water conductivity by 79.92% and 36.45% respectively.