Abstract: Still-lateral-pressure-coefficient K₀ is a important coefficient in practical engineering. The main effect of the Still-lateral-pressure-coefficient is the properties of soil itself, and K₀ is a important engineering properties of the soil. It is tightness between the engineering properties and the microstructure of the soft. So we could explain lots of the soil's engineering properties through the microcosmic view. The research about the concern between the still-lateral-pressure-coefficient and microcosmic feature parameter explains that the parameters are not all relevant with K₀. The relevancy of K₀ with Roundness is big, while with Equiv Diam, AspectRatio and Count is small.