Fractal dimensions of particle surface were 2.805~2.942 in the plowed layers of 16 crop fields in Sichuan. Among them, sand soil was 2.821, loam soil 2.807, clay loam soil 2.916, and clay soil 2.939. Statistic analysis indicated that fractal dimensions were in highly significant negative correlation with the contents of coarse sand and fine sand, and in very significant positive correlation with the contents of silt and clay. In addition, in the partial correlation with the contents of silt, clay, organic matter and bulk density of soil was highly significant or significant.