This paper focused on the typically collapsing alluvial fan in Wuhua County

Guangdong Province，collected 64 soil samples and points location information by GPS RTK from the top to the edge of the alluvial fan to do the analysis of physical and chemical property. Through the combination of fractal theory

regression analysis and geo-statistics method

the paper aimed to expound the soil fractal dimension characteristic and spatial variability

and the correlation with soil particle composition and nutrient content in collapsing alluvial fan. The result indicated that there were obvious differentiation characteristics in soil particle composition and nutrient content

and presented certain regularity with the spatial distribution characteristics of fractal dimension. From the top to the edge of the alluvial fan

the proportion content of soil silt and clay and nutrient content increased gradually

and fractal dimension was a positive correlation with them. But the proportion content of sand decreased gradually

and presented a negative correlation with fractal dimension. Among them

clay content was the most influential factor to fractal dimension

and the coefficient correlation was up to 0.969.The results proved that the fractal dimension could be used as an important index of soil texture and fertility.