A well-developed ephemeral gully, which located in Pinus massoniana forests, was selected as study slope. Then, the spatial distribution characteristics of soil particle size in surface layer (0-5 cm) were studied. The results showed that:(1) The gravel content was higher in topsoil, which texture belonged to sandy. The water erosion led to the coarse soil surface. (2) Soil particle size distributions varied with the different topographic position of ephemeral gully, the content of gravel (>2 mm) showed that the groove P<0.01). All the Extremely coarse sand, coarse sand, fine sand, silt and clay contents were characterized by groove>gully slope>gully edge, and the contents in groove were significantly greater than the gully slope and edge (P<0.01). The difference between soil particle contents in gully slope and edge were not significant (P>0.05). (3) With the gully length direction from head to mizoguchi, the coarse particle contents decreased in groove, but the fine particle contents increased. And the opposite results were found in gully slope and edge. (4) All the optimal semi-variance functions for different graded soil particles were gaussian model, the largest nugget coefficient of soil particles content is only 0.36%, far less than 25%, showing a strong spatial correlation.