介绍了分形这一新兴的数学分支,并讨论了分形理论在土壤科学中的价值和应用。结合相应的模型论述了分形理论在土壤水分特征曲线及在土壤大孔隙流研究中的应用。 The new fractal branch of mathematics is introduced, and the value and application of fractal theory in soil science are discussed. Combined with the corresponding models, the fractal theory is discussed in the soil moisture characteristic curve and its application in the research of soil macropore flow.