Water retention,water flow and solute transport in soil,to some extent,depend on geometric characteristics of the soil pore,which can be accurately ident ified with the digital image analysis method.In this art icle,pore fractal dimensions and multiple pore outline fractal dimensions of some soil sample images are calculated with the area method and circumference method,separately.And the relationship between those fractal dimensions and soil texture is discussed.The results show that obvious fractal features can be found only of soil pore spaces of a certain scale.The finer the soil texture(or the higher the clay content),the higher the value of the fractal dimension.Comparatively,the pore fractal dimension calculated with the area method is more sensitive to soil texture than with the circumference method.